In general, losing 50 to 100 strands of hair per day is considered normal for healthy hair growth. However, if there is thinning or excessive hair loss beyond the usual, it may be an indication of health issues, high levels of stress, or significant hormonal changes. The causes can vary greatly, but there are measures that can be taken to address this problem and stimulate healthy hair growth again.

The cause of hair loss due to age is different from that caused by hormonal changes. The aging process results in the cessation of hair follicle growth. When hair turns gray, its structure changes due to the loss of color pigment, causing the hair to change color to white. Although hair loss due to age cannot be avoided, the use of treatments such as minoxidil can help stimulate hair regrowth if hair loss occurs at an early age.

There are several variants of alopecia areata: Alopecia areata patchy: Partial hair loss on the scalp or other parts of the body. Alopecia totalis: Results in complete or near-complete hair loss on the scalp. Alopecia universalis: Causes total hair loss on the scalp, face, and entire body, which is a rare type. Alopecia with scar tissue formation: Hair follicles experience total destruction, resulting in the formation of scar tissue, preventing hair regrowth.

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Disorder of Trichotillomania is a form of obsessive-compulsive disorder (OCD) that causes individuals to pull out their own hair. Such actions can damage hair follicles and skin, resulting in hair loss. Generally, Trichotillomania appears as a response to stress and anxiety, often becoming a habit. Although it occurs more frequently in children, this condition often improves without treatment.

After childbirth, hormonal changes and stress levels can be triggering factors for hair loss. Decreased estrogen levels after giving birth can cause excessive hair loss, while stress and trauma experienced during the delivery process can worsen the condition. Typically, hair loss begins around four months after giving birth, but often the hair condition will return to normal within about a year.

This happens when the tension or tightness of a ponytail or braid pulls the hair and damages the follicles. Various hair treatments such as coloring, straightening, or continuous braiding can also damage the hair, making it thin or even fall out. Hair loss can also be caused by friction with clothing, known as friction alopecia, especially on the legs.

Sexually transmitted diseases (STDs), such as syphilis, can cause hair loss in the scalp, eyebrows, and face. Antibiotic therapy to treat syphilis can stop further hair loss, and the hair will regrow after the disease is resolved. Human immunodeficiency virus (HIV) can also have indirect effects on hair loss.