Erectile dysfunction: when an erection is not firm enough or fades too soon

If your penis repeatedly fails to become firm enough or your erection subsides too soon, you may have erectile dysfunction. Occasional fluctuations are common and are not a diagnosis in themselves. Physical causes, stress and pressure to perform can overlap; a careful assessment helps you find appropriate treatment.

Philipp MarxFounder of RattleStork

Published15 October 2024Updated26 September 2026

Black-and-white photograph of a man with his head lowered and both hands covering his face against a dark background

A brief overview

Firmness, duration and the situation help put changes into context: does the erection not become firm enough, subside early, or both?
Four firmness grades can help you describe difficulties more clearly. The scale does not explain the cause or measure how good sex feels.
Stress and physical factors can be present together; morning erections do not reliably exclude a physical cause.
Treatment can include changes to daily life, sex therapy, medicines or devices. The cause, safety and your needs are central.

When is it erectile dysfunction?

Erectile dysfunction is a repeated difficulty getting or maintaining an erection sufficient for the sexual activity you want. It need not mean a complete inability to have an erection: the penis may become larger but stay too soft, or the erection may subside when you put on a condom, change position or shortly after penetration starts.

This can happen temporarily after poor sleep, a lot of alcohol or in a tense situation. If it happens repeatedly, your erections change significantly or it is troubling you, it is worth having an assessment. You do not have to be unable to have any erections or wait for months. The patient information from the US health institute NIDDK explains the medical definition.

How erection firmness develops

An erection results from arousal, nerves and blood vessels working together. Smooth muscle in the erectile tissue relaxes, allowing more blood to flow in, while the filled tissue slows the outflow through the veins. The pelvic floor muscles also help provide firmness. The clinical review Erectile hydraulics describes this interaction.

That is why size and firmness are different. An erection you can see may still be too soft for penetration; an erection that is not at maximum firmness throughout may nevertheless be sufficient for the sex you want. There is no universal firmness score everyone must achieve. What matters is whether your erection is adequate and reliable for you.

Four grades: understanding the Erection Hardness Score

The Erection Hardness Score, or EHS, puts your own perception into four simple grades. It can help you explain more precisely to a doctor what has changed.

EHS 1: enlarged, but not hard: The penis becomes larger but does not yet have sufficient firmness.
EHS 2: hard, but not hard enough for penetration: There is an erection, but its firmness is not sufficient for penetration.
EHS 3: hard enough for penetration, but not completely hard: Penetration is possible although the erection has not reached the highest degree of firmness.
EHS 4: completely hard and rigid: This is the highest grade on the scale.

Research into the scale includes a study on the relationship between EHS and intercourse. The score describes firmness, not the cause of a difficulty or the quality of sex. EHS 3 is not automatically a medical problem, and EHS 4 guarantees neither desire nor wellbeing. Duration also matters: an erection that is firm but quickly subsides can still be a significant problem.

Why erections sometimes subside

Sexual arousal does not progress in a straight line. Touch, pace, distractions, tiredness and feeling safe can change during an encounter. An erection that softens during a pause and returns with pleasurable stimulation is different from a recurring difficulty despite adequate arousal.

Putting on a condom or getting ready for penetration can create extra pressure: it has to work now. Attention then moves away from touch and towards monitoring the erection. A pause, more time and allowing things to unfold without a fixed goal can help. Check the fit and practise putting on a condom when you are relaxed, so that you stay protected even when you feel nervous.

Simply remembering typical situations is enough for a later discussion with a doctor. You do not need to test or score your erection every day.

Physical causes, stress and medicines

Dividing causes into purely physical or psychological often misses how they interact. A slightly less reliable erection for physical reasons can lead to pressure to perform, and that pressure can make the next encounter harder.

Blood vessels and metabolism: Diabetes, high blood pressure, raised blood lipids and smoking can affect blood vessel function. Lack of exercise and substantial excess weight can also play a part.
Nerves, hormones and changes in the penis: Nerve injuries, some neurological conditions and procedures in the pelvis can affect erections. Hormonal disorders, pain or a newly developed curvature should also be assessed.
Psychological and situational strain: Stress, anxiety, depressive symptoms, conflict and distressing sexual experiences can interfere with arousal and erections. Younger people can be affected too.
Medicines and other substances: Some blood pressure medicines, antidepressants, sedatives and hormone treatments can contribute. Heavy drinking and other drugs may also interfere. Do not stop prescribed medicines yourself; discuss whether the timing of your symptoms may be related.

The NIDDK information on symptoms and causes outlines these possible triggers. A list alone cannot tell you what is causing your symptoms.

What morning erections and masturbation tell you

If erections occur in the morning or during masturbation but are unreliable with a partner, expectations and the situation may be important. This does not make the symptoms imaginary. Nor does it mean there is no attraction or that someone is at fault.

Equally, the absence of a morning erection does not prove a blood vessel disorder. Sleep and the moment you wake affect what you notice. These observations are useful clues for a conversation, not reliable tests you can perform yourself. Physical and situational factors can exist alongside one another.

Desire, erection and orgasm are related, but they are not the same. A less firm erection therefore does not, on its own, show how aroused someone is. Read more about their relationship in the article on orgasm.

Why cardiovascular health is part of the picture

New or worsening erection difficulties can be a reason to check blood pressure, blood glucose, blood lipids and other vascular risks. Erectile dysfunction and cardiovascular disease have important risk factors in common; where erection problems are vascular, they may occur before heart disease is recognised.

This does not mean that every soft erection points to a heart problem. It explains why a thorough assessment considers more than sexual function. The EAU guideline on erectile dysfunction explicitly addresses this link.

What to expect from a medical assessment

Your first appointment can be with a GP or a urologist. It usually begins with the history: when did the difficulty start, how often does it occur, and is the problem getting firm, staying firm or both? You will also be asked about desire, pain, medicines, existing health conditions and stress.

Depending on the circumstances, the next steps may include an examination, blood pressure measurement and blood tests, for example to check glucose metabolism, blood lipids and hormones. An abnormal result needs to be interpreted alongside the symptoms. Ultrasound and specialised function tests are not needed at every initial appointment. The NIDDK information on diagnosis explains the process.

Before the appointment, you can note down:

When the problem started, how often it occurs, and the situations in which erections are better or worse.
Whether the erection does not get firm enough, subsides early, or both.
Changes in desire, pain, curvature, ejaculation or urination.
All medicines and supplements, including erection products you have bought yourself.
What you hope treatment will achieve and what is troubling you most.

Can erection firmness be measured objectively?

Yes, although different methods measure different properties. Devices such as RigiScan can record changes in circumference and firmness during the night; Doppler ultrasound looks at blood flow. These tests address particular diagnostic questions. One measurement cannot replace a discussion or an understanding of your everyday sexual experience.

Elastography uses ultrasound to assess tissue properties. A small study of 37 healthy men found measurable changes during erections. This does not establish a general maximum firmness or a need for routine testing. Firmness under pressure from the side and resistance to bending are also distinct measurements.

For you, the more useful question is usually: which investigation would actually change the next steps in treatment?

Changes you can make yourself

There is no dependable instant solution for every cause. Steps that support health and ease sexual pressure can help: regular physical activity, less alcohol, stopping smoking and enough rest. This is neither a guarantee nor a reason to blame yourself. People with healthy lifestyles can also have erection difficulties that need treatment.

In your sex life, it can help to allow touch without immediately linking it to penetration. Make space for a pause, other kinds of closeness or a slower start. If the erection softens, the whole encounter need not end. How does sex work? gives a broader overview.

Begin with changes you can realistically make, rather than trying to get sleep, exercise, diet and sex perfect all at once. When symptoms recur, these steps can support treatment, but they should not keep delaying your appointment.

Breaking the cycle of pressure and monitoring

A man and a woman sit on a sofa, talking quietly.

After an experience that leaves you uncertain, anticipating next time can itself become difficult. During sex, you repeatedly check whether the erection is holding. That takes attention away from arousal, and every change feels like evidence that it is going wrong again.

A conversation away from the sexual situation can ease the pressure. Explain what makes you unsure, what kinds of touch feel good and that pausing does not mean rejection. You can agree together that penetration is welcome if it happens, but is not a requirement.

Psychosexual counselling or sex therapy can help, especially when anxiety, avoidance or relationship conflict is involved. It can accompany medical treatment. If premature ejaculation is also troubling you, raise both issues so that treatment can be tailored accordingly.

Sildenafil and tadalafil: what tablets can offer

Sildenafil and tadalafil are medicines known as PDE-5 inhibitors. They support the physical erection response, but do not create desire and require sexual stimulation. Which one is suitable depends in part on other health conditions, other medicines and the timing you would prefer.

Food can delay sildenafil taking effect. Tadalafil has a longer window of action; in some circumstances, daily treatment prescribed by a doctor is an option. A longer window of action does not mean a continuous erection. The EMA information on tadalafil explains how it is used.

A first attempt that is disappointing does not prove that treatment cannot work. Discuss when you take it, stimulation and expectations rather than increasing the dose yourself or combining medicines. Possible side effects include headache, facial flushing and indigestion. The EMA information on sildenafil describes its effects, side effects and restrictions.

PDE-5 inhibitors must not be combined with nitrates for angina or with poppers. Blood pressure can drop dangerously. Some other medicines, including riociguat, also make the combination unsuitable. Tell your clinician about all medicines and substances you use before treatment. If you have serious heart problems, it is also necessary to establish whether sexual exertion is currently safe.

Buying from an uncertain source does not replace this assessment. Seek advice from a doctor and pharmacist about an authorised medicine.

Other treatment options

If tablets are unsuitable or do not help enough, other treatments remain available. The choice depends on what is affecting the erection and what you can use in practice.

Vacuum erection devices: Negative pressure draws blood into the penis, and a suitable ring can maintain the erection. You should be shown how to use the device and told about possible side effects and safe duration of use.
Local medicines and injections: Some medicines can be administered into the urethra or injected into the erectile tissue. This requires medical instruction and a clear plan for an erection that lasts too long.
Penile implants: For selected people, surgery can be an option when other approaches are unsuitable or have failed. Benefits, risks and the permanent change must be discussed thoroughly beforehand.

The NIDDK information on treatment describes these options and the counselling that accompanies them. Decisions should consider effectiveness, tolerability, how the treatment is used and what you want from your sex life.

Testosterone, pelvic floor exercises and supplements

Testosterone is not a general treatment for better erections. Treatment can be considered where deficiency has been confirmed and symptoms fit, not simply because erections are softer. A low result is checked by taking another fasting blood sample in the morning. This is particularly relevant when trying for a baby: taking testosterone can suppress sperm production. The Endocrine Society guideline advises against this treatment when you plan to try for a baby in the near future.

Guided pelvic floor training may help some people. A small randomised trial studied exercises together with biofeedback, which gives feedback on muscle activity. This does not guarantee that any exercises done at home will work. If you have pain or muscle tension, get advice on suitable training. Looking for other causes remains important.

Take particular care with supplements and supposedly natural sexual enhancement mixtures. Many have no convincing evidence of effectiveness; some contain undeclared medicines. The information on sexual enhancement products from the US research centre NCCIH highlights this. When offered additional treatments, ask how strong the evidence is for a benefit in your situation, what the risks are and what alternatives are available.

Erection difficulties when trying for a baby

When sex feels as though it must succeed on fertile days, it can create extra time pressure. Erection firmness does not reliably indicate sperm quality. Problems with intercourse and possible reduced fertility should be considered separately.

Mention that you are trying for a baby during your consultation, including before medicines are prescribed. This helps coordinate treatment and family planning. The article Erection difficulties when trying for a baby explores this situation in more detail.

When you need medical help

Book an appointment if symptoms keep coming back, worsen or trouble you. This is particularly relevant with diabetes, vascular risks, new medicines, noticeably reduced desire or pain. New curvature, a lump you can feel in the penis, blood in the urine or significant urinary symptoms also need assessment. With blood in semen, recurrence and other symptoms are among the considerations.

If an erection has lasted three to four hours and is not subsiding, go to an emergency department immediately. Seek help earlier if pain is severe. With sickle cell disease, a painful erection lasting longer than an hour already requires this action. A prolonged erection, or priapism, can damage tissue. Do not wait for sex or masturbation to bring it to an end. The NHS information on priapism explains why it is urgent.

Acute chest pain, severe breathlessness or sudden paralysis or speech difficulties are emergency signs: call the emergency services (112 in Germany). Tell the treating team about any erection medicine you took and when, especially before medicines for chest pain are given. Sudden severe testicular pain, or sudden loss of sight or hearing after an erection medicine, also needs immediate medical assessment.

Myths and facts

Only an erection at maximum firmness is normal.: Firmness can vary. Adequate function, reliability and your symptoms matter, rather than continuously reaching the highest grade.
In younger people, it is always psychological.: Physical causes can occur at younger ages too. Age alone cannot replace an assessment.
If it works alone, you are not attracted to your partner.: You cannot conclude this from the pattern. Circumstances, pressure and stimulation can differ considerably.
An erection medicine automatically deals with the cause.: Medicines can support erections, but do not automatically resolve vascular problems, side effects or distressing pressure to perform.

Conclusion

Effective care for erectile dysfunction starts with understanding what has changed and what you need. Whether erections remain too soft, subside early or become unreliable only under pressure, recurring symptoms can be investigated and often treated. Raise the problem openly, consider possible physical causes and allow room for a sexual life without constantly assessing firmness.

These articles look more closely at trying for a baby, sexual arousal, orgasm and premature ejaculation.

Frequently asked questions about erectile dysfunction and erection firmness

Does a softer erection mean I have erectile dysfunction?

A single softer erection is not enough to make a diagnosis. What matters is whether firmness or duration is repeatedly insufficient, has changed noticeably or is troubling you. A medical assessment is then worthwhile.

Is EHS 3 sufficient, or should it always be EHS 4?

Grade 3 on the EHS scale means the erection is firm enough for penetration, although not completely hard. Grade 4 is not a compulsory target. It also matters whether the erection lasts long enough and whether you are satisfied with your sex life. Have recurring or troubling changes assessed.

Why does my erection soften when putting on a condom or changing position?

A break in stimulation, distraction or pressure to perform can contribute. Allowing more time and being familiar with handling condoms may ease the pressure. Repeated difficulties still need assessment rather than automatically being put down to the condom alone.

Do morning erections exclude a physical cause?

No. Morning erections provide a clue but do not reliably rule out physical causes. Their absence does not prove disease either, as sleep and the time you wake influence what you notice.

Why can I get an erection during masturbation but not with a partner?

Stimulation, pace and expectations may be different. Situational pressure often contributes, but this pattern does not prove either a purely psychological cause or a lack of attraction. A conversation and, if symptoms persist, an assessment can help make sense of it.

Who should I see about erection problems?

A GP or urologist is an appropriate first contact. Bring a list of medicines and a few observations about onset, frequency, firmness, duration and accompanying symptoms. You do not need to carry out measurements yourself beforehand.

Does an unsuccessful first try with sildenafil mean medicines will not work?

One unsuccessful attempt does not mean medicines cannot help. With sildenafil, timing, a meal and sufficient sexual stimulation can all matter. Discuss the outcome with a doctor rather than increasing the dose yourself or combining erection medicines.

Can I take erection medicines with poppers or a nitrate medicine?

No. PDE-5 inhibitors such as sildenafil or tadalafil must not be used with poppers or nitrates, as blood pressure can fall dangerously. Have all medicines and substances checked for interactions before starting treatment.

Can pelvic floor exercises improve erections?

Guided training may help some people; research has included exercises with biofeedback, which provides information about muscle activity. It is not a guaranteed answer to every cause. Where pain or tension is present, training should be adapted professionally. Persistent erection difficulties still need a medical assessment.

Does erectile dysfunction mean I am infertile?

No. The ability to have an erection and sperm quality are different things. Erectile dysfunction can make intercourse harder, but it does not, on its own, tell you whether you are fertile. If you are trying for a baby, discuss these two issues separately.

When is an erection lasting too long an emergency?

If an erection has lasted three to four hours and is not going down, go to an emergency department immediately. Get help earlier for severe pain; with sickle cell disease, a painful erection lasting more than an hour already needs help. Do not wait for sex, masturbation or a home remedy to resolve it.