Patchy hair loss, also known as alopecia areata, is a condition characterized by the sudden loss of hair in one or more patches on the scalp or other areas of the body. The hair loss typically results in smooth, round patches of hair loss, but can also present as irregular or irregularly-shaped patches.

There are several reasons for patchy hair loss, including :

• Genetics : Alopecia areata is thought to be an autoimmune disorder, and there is a genetic component to the condition.
• Hormonal changes : Hormonal changes, such as those that occur during pregnancy or menopause, can cause patchy hair loss.
• Medical conditions : Certain medical conditions, such as thyroid disorders, iron-deficiency anemia, and autoimmune disorders, can cause patchy hair loss.
• Medications : Certain medications, such as blood thinners, antidepressants, and blood pressure medications, can cause patchy hair loss as a side effect.
• Stress : Physical or emotional stress can cause patchy hair loss.

Symptoms of patchy hair loss include :

• Sudden loss of hair in one or more patches on the scalp or other areas of the body
• Smooth, round patches of hair loss
• Irregular or irregularly-shaped patches of hair loss