ED Symptoms: Early Signs and When to See a Doctor

ED symptoms: the checklist

Use this checklist to describe the problem at your visit. ED is sometimes called impotence; the same erection symptoms apply (NIDDK).

• Trouble getting an erection when you want to have sex (MedlinePlus).
• Trouble keeping it: the erection fades before or during sex (NIDDK). See can’t stay hard and losing an erection during sex.
• Reduced firmness: an erection that is not firm enough for intercourse (MedlinePlus).
• Sometimes but not others: erections sometimes, but not every time you want sex (NIDDK).
• Fewer morning or nighttime erections: a detail to report when describing your erections (MedlinePlus). Read no morning wood.
• Lower interest in sex: often listed alongside ED, but it is a different symptom; erection problems do not usually affect sex drive (MedlinePlus).

Early signs of erectile dysfunction vs normal occasional trouble

An occasional erection problem does not by itself establish ED. Look for a recurring change in getting hard, staying hard or firmness (MedlinePlus). Tell the provider whether it began suddenly or gradually and whether it happens with a partner, alone or in both settings.

Morning erections are a clue, not a home diagnosis. Their presence makes a physical cause less likely according to MedlinePlus; their absence alone does not identify a cause. Stress and anxiety can contribute (NIDDK). Read about no morning wood and performance anxiety and ED.

What each symptom may mean and who to see

The table links each pattern to a possible meaning and a sensible first contact. It is a guide for the conversation; only an assessment can identify your cause.

Sources: NIDDK symptoms and causes; NIDDK diagnosis; NIDDK treatment; NIDDK Peyronie’s disease; MedlinePlus; NHLBI; Thompson et al.; Viagra (sildenafil) label. Accessed Oct 25, 2026.

Not sure where to start? Read what doctor treats ED and our overview of the causes of ED.

Red flags: when ED symptoms need urgent care

• Sudden erection trouble with chest pain, heaviness or discomfort, during sex or at any time: call 911, even if you are not sure it is a heart attack (NHLBI). The Viagra (sildenafil) label notes a potential cardiac risk of sexual activity in people with existing cardiovascular disease.
• An erection lasting more than 4 hours, painful or not, needs immediate medical care (Viagra (sildenafil) label; Cialis (tadalafil) label).
• A new curve, hard lump or pain during erections: see a urologist about possible Peyronie’s disease (NIDDK).
• ED after an injury or prostate surgery, or with low back pain, abdominal pain or a change in urination: contact a provider (MedlinePlus).
• Sudden vision loss or sudden decrease or loss of hearing while taking an ED medicine: stop and seek care (Viagra (sildenafil) label; Cialis (tadalafil) label).

For recurring symptoms without these urgent signs: arrange an assessment. You do not have to wait until erections fail every time (MedlinePlus).

Is ED an early sign of heart disease?

Sometimes, which is why new ED deserves a health check. MedlinePlus says ED may be a sign of health problems such as diabetes or heart disease. The studies below describe groups of men, not your personal risk.

Sources: Thompson et al. 2005; Montorsi et al. 2003; MedlinePlus. Accessed Oct 25, 2026.

Ask whether you need a cardiovascular risk assessment, rather than assuming ED means heart disease (Thompson et al.). See ED and blood pressure and ED and diabetes.

The IIEF-5 (SHIM) questionnaire: how symptoms are scored

The IIEF-5 (SHIM) helps describe erection difficulties and their severity. This five-question tool covers erectile function and intercourse satisfaction (Rosen et al., 1999; SHIM terminology). It does not tell you what is causing the problem.

In the original validation study, scores ranged from 5 to 25; 22–25 indicated no ED and 5–7 severe ED. A cutoff of 21 best distinguished the study groups, with sensitivity 0.98 and specificity 0.88 (PubMed abstract). These are study results, not a substitute for an examination. Ask your provider to administer and interpret the questionnaire.

We do not reproduce the questionnaire items. Diagnosis also uses health and sexual history, examination and testing when appropriate (NIDDK).

What each path includes

Match the first step to your symptoms. These paths organize the conversation; they are not a self-treatment algorithm.

Sources: NHLBI; NIDDK diagnosis; NIDDK Peyronie’s disease; NIDDK treatment; Viagra (sildenafil) label; Cialis (tadalafil) label; FDA compounding Q&A. Accessed Oct 25, 2026.

What to bring to the visit

Write down when symptoms began, how often they occur, whether you lose firmness before or during sex, morning erections, and any change in desire. Bring a complete medicine and supplement list. These details help structure the history described by NIDDK. You can say: “I can get hard, but I lose firmness before sex is over. It started recently.”

Safety checks before ED medication

• Sildenafil and tadalafil are contraindicated with organic nitrates or riociguat (Viagra (sildenafil) label; Cialis (tadalafil) label).
• Common adverse effects include headache and flushing with sildenafil, and headache, indigestion and back pain with tadalafil (Viagra (sildenafil) label; Cialis (tadalafil) label).

Penile curvature changes the safety discussion too: the Cialis (tadalafil) label advises caution with anatomical deformation of the penis, such as Peyronie’s disease. Give the prescriber your full medicine list; see ED medication and nitrates.

Talk to a licensed provider about your symptoms

If your symptoms fit ED and none of the red flags apply, an online visit is one way to start. At Mendoxa, independent licensed providers review your symptoms, health history and medicines and decide whether treatment is appropriate. Prescription required.

Learn about ED treatment options before deciding whether to start a visit. An assessment comes before any prescribing decision. If you are considering Mendoxa, its compounded tablet is not FDA-approved.

FAQ

What are the early signs of erectile dysfunction?

Usually a pattern of erections that are harder to get, less firm or fade sooner than before (MedlinePlus). NIDDK lists getting an erection sometimes but not every time you want sex as a symptom.

When should I see a doctor for ED?

Arrange a visit if erection trouble keeps returning. MedlinePlus specifically advises seeing a provider when it happens more than 25% of the time. This is not a rule that you must wait to meet before asking for help.

Can I have ED if I still get morning erections?

Yes. Morning erections do not rule out erection difficulties during sex. They make a physical cause less likely (MedlinePlus), but a clinician still needs to assess the pattern.

Is ED a sign of heart problems?

It can be. In a 2005 JAMA study of men 55 and older, new ED was linked to later cardiovascular events, and the authors advised checking cardiovascular risk factors. ED does not prove heart disease; chest pain needs a 911 call (NHLBI).

Is low sex drive a symptom of ED?

Not usually: MedlinePlus says erection problems do not usually affect sex drive, while low testosterone can reduce it. Mention both symptoms if you have them.

When is an erection a medical emergency?

When it lasts more than 4 hours, painful or not. The Viagra (sildenafil) label and Cialis (tadalafil) label both call for immediate medical care.

References

1. DailyMed: VIAGRA (sildenafil citrate) tablet, film coated, label revised 12/2017. Accessed Oct 25, 2026.
2. DailyMed: CIALIS (tadalafil) tablet, film coated, label revised 3/2026. Accessed Oct 25, 2026.
3. DailyMed: APOKYN (apomorphine hydrochloride) injection, label revised 6/2022. Accessed Oct 25, 2026.
4. FDA (Drugs@FDA): VIAGRA (sildenafil) prescribing information, NDA 020895. Accessed Oct 25, 2026.
5. FDA (Drugs@FDA): CIALIS (tadalafil) prescribing information, NDA 021368. Accessed Oct 25, 2026.
6. FDA: Compounding and the FDA, questions and answers. Accessed Oct 25, 2026.
7. NIDDK: symptoms and causes of ED. Accessed Oct 25, 2026.
8. NIDDK: definition and facts for ED. Accessed Oct 25, 2026.
9. NIDDK: diagnosis of ED. Accessed Oct 25, 2026.
10. NIDDK: treatment for ED. Accessed Oct 25, 2026.
11. NIDDK: penile curvature (Peyronie’s disease). Accessed Oct 25, 2026.
12. MedlinePlus: erection problems. Accessed Oct 25, 2026.
13. NHLBI: heart attack symptoms. Accessed Oct 25, 2026.
14. Rosen RC, et al. Development and evaluation of an abridged, 5-item version of the International Index of Erectile Function (IIEF-5) as a diagnostic tool for erectile dysfunction. Int J Impot Res. 1999;11(6):319-26. PMID 10637462. Accessed Oct 25, 2026.
15. Thompson IM, et al. Erectile dysfunction and subsequent cardiovascular disease. JAMA. 2005;294(23):2996-3002. PMID 16414947. Accessed Oct 25, 2026.
16. Montorsi F, et al. Erectile dysfunction prevalence, time of onset and association with risk factors in 300 consecutive patients with acute chest pain and angiographically documented coronary artery disease. Eur Urol. 2003;44(3):360-4. PMID 12932937. Accessed Oct 25, 2026.
17. Vroege, 1999: The sexual health inventory for men (IIEF-5). Accessed Oct 25, 2026.
18. Mendoxa ED care (product, format, max 1 dose per 24 hours). Accessed Oct 25, 2026.

Related guides

• Causes of ED
• What doctor treats ED?
• Erectile dysfunction treatment
• No morning wood: what it means
• Performance anxiety and ED
• Low testosterone and ED
• Can ED be reversed?
• Online ED prescription
• Why can’t I stay hard?
• Losing an erection during sex

Compounded medication prescribed only if a licensed U.S. clinician decides it is appropriate. Not FDA-approved as a finished product. Not available in California. This site is not for emergencies. Call 911 if you need urgent care.