An erection that lasts for hours might sound like a subject for jokes, but a condition known as priapism can become a serious medical emergency. The condition involves a prolonged erection that continues for four hours or longer and can cause permanent damage to penile tissue if treatment is delayed.
Priapism is not necessarily linked to sexual arousal or activity. It can develop because of underlying blood disorders, certain prescription medications, substance use or injuries affecting blood flow.
Understanding the causes, warning signs and treatment options is important for men’s health. Most importantly, an erection lasting four hours or longer requires emergency medical attention, even if the person is embarrassed to seek help.
What Is Priapism?
Priapism is a prolonged erection that persists beyond the body’s normal erectile response. During a typical erection, blood flows into the penis and later drains away, allowing it to return to its usual state.
With priapism, that process is disrupted. Blood may become trapped in the erectile tissue, preventing the penis from returning to its flaccid state.
According to the Mayo Clinic, the condition has two main forms: ischemic and nonischemic priapism.
Ischemic priapism, also called low-flow priapism, is the more common and urgent form. It occurs when blood cannot drain properly from the penis. The trapped blood becomes deprived of oxygen, potentially damaging tissue if the condition is not treated promptly.
Nonischemic priapism, known as high-flow priapism, generally occurs when an injury disrupts normal arterial blood flow. It is often less painful and may carry a lower risk of tissue damage, but it still requires medical assessment.
What Causes Priapism in Men?
Priapism can develop for several reasons, and doctors may not always identify a single underlying cause.
1. Sickle cell disease and other blood disorders
Sickle cell disease is an important risk factor for priapism. The condition changes the shape and behaviour of red blood cells, which can obstruct blood vessels and interfere with circulation.
Other blood disorders, including leukaemia, may also contribute to the condition.
Men with sickle cell disease should take prolonged or recurrent erections seriously and follow their medical team’s emergency guidance. Painful erections lasting even an hour may require urgent assessment in this group.
2. Prescription medications
Some medications can trigger priapism as a side effect. These include certain antidepressants, medicines used to treat psychiatric conditions and drugs prescribed for erectile dysfunction.
Medications injected into the penis to help produce an erection can also cause the condition if the response lasts too long.
Anyone experiencing a prolonged erection after taking medication should seek medical advice immediately. Do not stop prescribed treatment or change a dosage without consulting a healthcare professional.
3. Alcohol and recreational drugs
Substance use, including cocaine and excessive alcohol consumption, has been associated with priapism.
The likelihood of developing the condition depends on several factors, including the substance involved, individual health and other medications being taken.
4. Injuries and trauma
An injury involving the penis, pelvis or perineum—the area between the genitals and anus—can disrupt normal circulation and lead to nonischemic priapism.
Unlike the more painful low-flow form, high-flow priapism may involve an erection that is not fully rigid and causes little pain. However, symptoms alone cannot reliably establish which type is present.
What Are the Warning Signs?
The main warning sign is an erection that lasts four hours or longer, particularly when it continues after sexual stimulation has stopped.
Other symptoms may include:
- Persistent or worsening pain in the penis.
- A rigid penile shaft with a softer tip.
- An unwanted erection that repeatedly occurs and subsides over several hours.
- An erection following an injury to the genital or pelvic area.
Not every case is painful, and the absence of pain does not rule out priapism.
If an erection lasts four hours or longer, go to an emergency department immediately. Do not wait for it to resolve on its own. Delaying treatment can lead to permanent tissue damage and erectile dysfunction.
How Is Priapism Treated?
Treatment depends on the type of priapism, its severity and the underlying cause. Medical professionals must determine whether blood is trapped in the penis or whether abnormal arterial blood flow is responsible.
For ischemic priapism, treatment typically aims to remove trapped blood and restore normal circulation as quickly as possible.
Draining trapped blood
Doctors may use a needle and syringe to remove excess blood from the erectile tissue. The procedure, known as aspiration, is generally performed with local anaesthesia to reduce discomfort.
The penis may also be flushed with saline solution as part of the treatment.
Medication
A clinician may inject a medication such as phenylephrine into the erectile tissue to help reduce blood inflow and restore normal drainage. Patients may need monitoring for side effects, including changes in blood pressure.
Surgery or other procedures
If aspiration and medication do not resolve the problem, a specialist may recommend a procedure to redirect blood flow or otherwise address the underlying problem.
For nonischemic priapism, doctors may recommend observation when appropriate. Some cases require a procedure to block abnormal blood flow or repair an injury.
The distinction matters because treatments that are appropriate for one type may not be suitable for the other.
Can Priapism Be Prevented?
Not every case can be prevented, particularly when an underlying genetic or blood disorder is involved. However, identifying risk factors and managing existing conditions may help reduce the likelihood of recurrent episodes.
Practical steps include:
- Managing sickle cell disease and other relevant medical conditions with professional guidance.
- Discussing possible medication side effects with a doctor.
- Seeking advice about recurrent or prolonged erections rather than ignoring them.
- Avoiding recreational drugs associated with priapism.
- Informing healthcare professionals about medications and substances taken before symptoms begin.
There is no universal prevention method that guarantees protection against priapism. Anyone who experiences repeated episodes should be evaluated by a healthcare professional, even if the erections eventually subside.
Why Prompt Medical Attention Matters
Priapism is a medical condition, not a measure of sexual performance or stamina. The most important distinction is whether the prolonged erection is caused by impaired blood drainage, which can deprive tissue of oxygen and lead to lasting injury.
Embarrassment should never delay treatment. Medical teams are equipped to assess and manage intimate health emergencies professionally and confidentially.
The bottom line: An erection lasting four hours or longer requires emergency medical care. Early treatment can help prevent serious complications, including permanent erectile dysfunction.
Health note: This article provides general educational information and is not a substitute for professional medical advice, diagnosis or treatment.