Priapism: Recognising the Signs and When to Seek Medical Help in the UK

Priapism is a relatively rare but serious medical condition involving a persistent, often painful erection that lasts for four hours or longer. Importantly, this occurs in the absence of sexual desire or arousal, and the erection does not subside after ejaculation. In the UK, healthcare professionals categorise this as a urological emergency because the blood trapped in the penis lacks oxygen, which can damage the delicate erectile tissues (the corpora cavernosa) if not drained promptly.

The name originates from Priapus, the Greek god of fertility, but the reality of the condition is far from mythical. It is a physiological breakdown of the blood flow mechanism in the penis. While it can affect males of any age, it is most frequently observed in two distinct age groups: children (often due to sickle cell disease) and men between the ages of 20 and 50.

It is vital to distinguish between the two main types of this condition, as their urgency and treatment pathways differ significantly:

Ischaemic Priapism (Low-Flow)

This is the most common type and is a true emergency. It occurs when blood enters the penis but cannot flow back out, causing a buildup of stagnant, deoxygenated blood. The penis is usually rock hard, and the condition is typically very painful. According to NICE clinical knowledge summaries, ischaemic priapism requires immediate intervention to avoid permanent scarring and erectile dysfunction.

Non-Ischaemic Priapism (High-Flow)

This type is less common and usually results from an injury to the penis or the perineum (the area between the scrotum and the anus). The injury creates a rupture in an artery, leading to a constant, unregulated flow of blood into the erectile tissue. In these cases, the erection is often less rigid and significantly less painful than the ischaemic type. While still requiring medical assessment, it is generally not considered as immediately limb-threatening as the low-flow version.

Several factors can disrupt the normal blood flow to the penis. In the UK, these are the most common triggers:

• Blood Disorders: Sickle cell anaemia is a leading cause, particularly in children and young men. The abnormally shaped red blood cells can block the outflow of blood.
• Medication Side Effects: Certain prescription drugs used to treat erectile dysfunction (such as alprostadil or papaverine injections), as well as some antidepressants (like trazodone) and antipsychotics, can interfere with the signals that tell the penis to relax.
• Recreational Drug Use: Alcohol, cocaine, and marijuana have all been linked to episodes of priapism.
• Injury: Trauma to the spinal cord or the genital area can damage the nerves and blood vessels responsible for maintaining and ending an erection.
• Insect Bites: Though rare, certain stings (such as from the Black Widow spider or specific scorpions) contain toxins that can trigger a prolonged erection.

If you suspect you are experiencing priapism, you should not wait for it to 'go away' on its own. The primary concern is permanent erectile dysfunction. When blood is trapped in the penis for many hours, it becomes deprived of oxygen. This leads to hypoxia and eventually the death of the erectile tissue.

Over time, the dead tissue is replaced by fibrous scar tissue (fibrosis). Once this scarring occurs, the penis may lose its ability to achieve a natural erection in the future. In severe cases, where medical attention is delayed beyond 24 to 48 hours, the damage is often irreversible, and even surgical options may have limited success in restoring function.

If you are currently experiencing an erection that has lasted for four hours or more, you should skip the GP and go straight to an Accident and Emergency (A&E) department. However, there are times when speaking to an online doctor is appropriate:

• Post-Episode Care: If you have recently recovered from a brief episode that resolved before the four-hour mark (sometimes called 'stuttering priapism'), you should book a GP consultation to investigate underlying causes.
• Medication Review: If you are concerned that a new medication for mental health or blood pressure is causing frequent or unusually long-lasting erections.
• Risk Assessment: Men with conditions like sickle cell disease may wish to speak to a GP online about preventative measures and lifestyle advice to avoid triggers.
• Psychological Support: Recovering from a urological emergency can be stressful; a GP can provide support or referrals for the emotional impact of men's health concerns.

An online doctor can review your medical history, discuss symptoms, and provide a private referral to a urologist if further diagnostic tests (such as blood tests or ultrasound scans) are required.

Upon arrival at a UK hospital, doctors will first determine the type of priapism you have. For ischaemic priapism, the goal is to relieve the pressure immediately. Common treatments include:

• Aspiration: Numbing the penis and using a needle to drain the excess, trapped blood.
• Intracorporeal Injection: Injecting medications (such as phenylephrine) that cause the blood vessels to constrict, allowing blood to flow out.
• Surgical Shunt: If other treatments fail, a surgeon may create a small bypass (shunt) to redirect blood flow and restore circulation.

For non-ischaemic priapism, doctors may choose to 'wait and see', as it often resolves without surgery, or they may use selective embolisation to block the ruptured artery causing the high blood flow.