Disease Comparison

Overview

Androgenetic Alopecia

Androgenetic alopecia is a common form of hair loss caused by a combination of genetic susceptibility and the effects of androgen hormones on hair follicles. It can affect people of different sexes and usually develops gradually. Hair becomes progressively thinner because affected follicles produce shorter and finer hairs. The pattern varies between individuals, with thinning commonly occurring at the crown or hairline in men and more diffuse thinning over the top of the scalp in women. Early evaluation can help identify treatable causes of hair loss.

Peyronie Disease

Peyronie disease is a condition in which scar tissue, called a plaque, develops inside the penis and can cause curvature or changes in shape during an erection. The plaque may cause pain, shortening, narrowing, or difficulty with sexual activity. Some cases remain stable, while others change over time. The exact cause is not always clear, but injury or repeated minor trauma may contribute in susceptible individuals. Treatment depends on symptoms, degree of curvature, erectile function, and whether the condition is stable or still changing.

Symptoms

Shared

None

Only in Left Disease

Joint Stiffness

Only in Right Disease

Testicular Pain Vaginal Discharge

Causes

Shared

Genetics

Only in Left Disease

Hormonal Imbalance

Only in Right Disease

None

Diagnosis

Androgenetic Alopecia

Androgenetic alopecia is usually diagnosed from the pattern and gradual progression of hair loss, medical history, family history, and examination of the scalp and hair. A clinician may use dermoscopy or other methods to examine follicle changes. Laboratory testing is not always necessary but may be considered when symptoms suggest another cause, such as nutritional deficiency, thyroid disease, hormonal abnormalities, or inflammatory scalp disease. Sudden, patchy, painful, or rapidly progressive hair loss warrants evaluation for alternative diagnoses.

Peyronie Disease

Peyronie disease is usually diagnosed from the medical history and physical examination. The clinician may ask about when curvature or pain began, whether it is changing, and whether erectile function has changed. Examination may identify the location and extent of plaque. Photographs of an erection or assessment of penile curvature during an induced erection may help determine severity when treatment is being considered. Ultrasound can evaluate plaque and blood flow when additional information is needed.

Prevention

Androgenetic Alopecia

Androgenetic alopecia cannot always be prevented because genetic and hormonal factors are central to its development. Avoiding unnecessary traction, harsh chemical treatments, and practices that repeatedly damage hair may help prevent additional hair breakage or traction-related loss. A balanced diet supports normal hair growth, although supplements are not useful unless a deficiency is present. Early assessment of progressive hair thinning can help distinguish androgenetic alopecia from nutritional, hormonal, inflammatory, or other treatable causes.

Peyronie Disease

Peyronie disease cannot reliably be prevented because the exact cause is uncertain. Avoiding unnecessary trauma to the penis and using appropriate care during sexual activity may reduce injury-related risk, although this does not guarantee prevention. People who notice persistent pain, new curvature, or a change in erectile function should seek evaluation rather than repeatedly traumatizing the affected area. Early assessment can help determine whether the condition is changing and whether treatment is appropriate.

Risk Factors

Androgenetic Alopecia

Risk of androgenetic alopecia is strongly influenced by family history and age. Hormonal sensitivity of hair follicles also plays an important role. The condition can affect people of different sexes, although the typical pattern differs. Hair loss may become more noticeable with increasing age. Other forms of hair loss can coexist, so sudden shedding, scalp inflammation, patchy loss, or rapidly changing symptoms should not automatically be attributed to androgenetic alopecia.

Peyronie Disease

Risk factors for Peyronie disease include increasing age, previous injury to the penis, repeated minor trauma, and a family history of the condition. Certain connective-tissue disorders may also increase susceptibility. Erectile dysfunction can occur alongside Peyronie disease and may complicate symptoms. Not everyone with a possible risk factor develops the condition, and many affected people do not recall a specific injury.