Causes of Swollen Penis

Male Enlargement

A swollen penis, also known as penile swelling, can be a cause for concern and discomfort. It occurs when there is an abnormal increase in size and volume of the penis, leading to pain, inflammation, and difficulty in performing everyday activities. Several factors can contribute to this condition, ranging from infections to underlying medical conditions.

One of the most common causes of penile swelling is an infection. Sexually transmitted infections (STIs) such as gonorrhea, chlamydia, and herpes can lead to inflammation and swelling of the penis. These infections can be transmitted through unprotected sexual contact, and it is important to practice safe sex to prevent their occurrence. In addition to STIs, urinary tract infections (UTIs) can also cause penile swelling, as the bacteria can travel from the urethra to the penis.

Another possible cause of swollen penis is priapism, a condition characterized by a persistent, painful erection that lasts for more than four hours. This condition, although rare, can be caused by various factors such as certain medications, blood disorders, or trauma to the genital area. Priapism requires immediate medical attention, as it can lead to irreversible damage to the penis if left untreated.

What Causes Swollen Penis?

A swollen penis can be a cause for concern and may indicate an underlying health issue. There are several potential causes of penile swelling, including infections, injury, allergies, and certain medical conditions.

Infections: Infections can lead to penile swelling. Common infections that can cause swelling include sexually transmitted infections (STIs) such as gonorrhea, chlamydia, and genital herpes. These infections can cause inflammation and swelling of the penis, along with other symptoms like pain, discharge, and sores.

Injury: Trauma to the penis can result in swelling. This can occur due to vigorous sexual activity, rough handling, or accidents. Injuries can cause blood vessels to rupture, leading to swelling and bruising. It’s important to seek medical attention if a penile injury occurs to rule out any underlying damage.

Allergies: Allergic reactions can cause swelling, itching, and redness of the penis. This can happen due to contact with irritants such as certain soaps, detergents, or latex condoms. It’s important to identify and avoid the allergen to prevent further swelling and discomfort.

Medical conditions: Some medical conditions can cause penile swelling as a symptom. These include conditions like priapism, which is a prolonged and painful erection that lasts for more than four hours. Other conditions like lymphedema, angioedema, and certain types of cancer can also lead to penile swelling.

Overall, it’s essential to consult a healthcare professional if you experience penile swelling. They can evaluate your symptoms, perform necessary tests, and provide appropriate treatment to address the underlying cause.


An infection is one of the possible causes of a swollen penis. There are several types of infections that can affect the penis, including:

  • Urinary tract infection (UTI): A UTI occurs when bacteria enters the urethra and travels up to the bladder. Symptoms may include pain and swelling in the penis, frequent urination, and a burning sensation while urinating.
  • Skin infections: Skin infections, such as balanitis or cellulitis, can cause the penis to become swollen. Balanitis is an infection of the foreskin or head of the penis, typically caused by poor hygiene or a yeast infection. Cellulitis is a bacterial infection that can occur anywhere on the body, including the penis.
  • Sexually transmitted infections (STIs): Several STIs, including gonorrhea, chlamydia, and genital herpes, can cause swelling and inflammation in the penis. These infections are typically transmitted through sexual contact.

Infections can be treated with medication, such as antibiotics or antifungal creams, depending on the specific infection causing the swelling. It is important to seek medical attention if you think you have an infection, as untreated infections can lead to complications and further health issues.

Infection Symptoms Treatment
Urinary tract infection (UTI) Pain and swelling in the penis, frequent urination, burning sensation while urinating Antibiotics
Skin infections (e.g., balanitis, cellulitis) Swelling of the penis, redness, discharge, pain Antibiotics or antifungal creams
Sexually transmitted infections (STIs) Swelling, inflammation, sores or blisters on the penis Antibiotics or antiviral medication

Allergic Reactions

Allergic reactions occur when the immune system reacts to a harmless substance as if it were harmful. The immune system releases chemicals, such as histamine, into the bloodstream to defend against the perceived threat. These chemicals can cause a range of symptoms, including swelling.

Allergens can come in many forms, such as foods, medications, insect bites, or exposure to certain chemicals. When the body encounters an allergen, it triggers an immune response that can lead to swelling of various body parts, including the penis.

Here are some common allergic reactions that can cause swelling of the penis:

  • Food allergies: Certain foods, such as nuts, shellfish, or soy, can trigger an allergic reaction that results in swelling. It is important to identify and avoid these trigger foods to prevent further reactions.
  • Medication allergies: Some individuals may be allergic to certain medications, such as antibiotics or pain relievers. Swelling of the penis can be a symptom of an allergic reaction to these medications. If you suspect a medication allergy, consult a healthcare professional immediately.
  • Insect bites or stings: Bee stings or spider bites can cause localized allergic reactions, resulting in swelling of the affected area, including the penis if bitten or stung in that region.
  • Chemical allergies: Exposure to certain chemicals, such as latex or specific types of lubricants, can trigger allergic reactions. This can manifest as swelling, itching, or redness of the penis.

If you experience swelling of the penis or any other allergic symptoms, it is important to seek medical attention. A healthcare professional can help identify the cause of the allergic reaction and provide appropriate treatment, such as antihistamines or epinephrine injections in severe cases.

Trauma or Injury

In some cases, swelling of the penis can be caused by trauma or injury. This can occur from a variety of factors, such as accidents, sports injuries, or rough sexual activity. When the penis is subjected to trauma, it can result in inflammation and swelling.

One common type of trauma to the penis is known as penile fracture. This occurs when the penis is forcefully bent or struck, causing the rupture of one or both of the cylindrical chambers in the penis known as the corpora cavernosa. This can lead to immediate swelling, pain, and discoloration of the penis. Immediate medical attention is required for the diagnosis and treatment of penile fracture, as surgical intervention may be necessary to repair the damaged tissues.

Other forms of trauma or injury to the penis, such as blunt force trauma or excessive stretching, can also cause swelling. It is important to seek medical attention if you experience swelling or other symptoms after a traumatic event involving the penis, as prompt treatment can help prevent complications and promote healing.

Sexually Transmitted Infections (STIs)

Sexually Transmitted Infections (STIs) are infections that are transmitted through sexual contact, including vaginal, anal, and oral sex. These infections are caused by bacteria, viruses, or parasites and can affect both men and women. STIs can cause a wide range of symptoms and health complications, including swollen genitals.

There are several common STIs that can cause swollen penis, such as:

  • Gonorrhea: This bacterial infection often causes painful urination, discharge, and swelling of the penis.
  • Syphilis: Syphilis is a bacterial infection that can cause painless sores on the genitals, along with swollen lymph nodes and flu-like symptoms.
  • Herpes: Herpes is a viral infection that can cause blisters and sores on the genitals, leading to swelling and discomfort.

In addition to these, other STIs such as chlamydia, trichomoniasis, and genital warts can also contribute to swollen penis. It is important to note that STIs can be easily transmitted through unprotected sexual contact, so practicing safe sex, including using condoms and getting tested regularly, is crucial in preventing these infections.

STI Cause Symptoms
Gonorrhea Bacterial infection Painful urination, discharge, swollen penis
Syphilis Bacterial infection Genital sores, swollen lymph nodes, flu-like symptoms
Herpes Viral infection Genital blisters, sores, swollen penis


There are several medications that can cause swelling of the penis. One example is angiotensin-converting enzyme (ACE) inhibitors, which are commonly prescribed to treat high blood pressure. These medications work by relaxing blood vessels, but they can also affect blood flow to the penis, leading to swelling and other symptoms. Other medications, such as diuretics and beta blockers, can also have similar side effects.

It is important to note that not all men will experience swelling of the penis when taking these medications, and the severity of the side effects can vary. If you are experiencing swelling of the penis or other unusual symptoms while taking any medication, it is important to discuss this with your doctor. They can help determine if the medication is the cause and provide alternative treatment options if necessary.

Common medications that can cause swelling of the penis:

  • Angiotensin-converting enzyme (ACE) inhibitors
  • Diuretics
  • Beta blockers
Medication Main purpose Possible side effects
ACE inhibitors Treating high blood pressure Swelling of the penis, decreased sexual function
Diuretics Reducing fluid retention Swelling of the penis, decreased libido
Beta blockers Lowering blood pressure and heart rate Swelling of the penis, erectile dysfunction
Titan Gel