Hair loss is a common sign with many possible causes and patterns. This page offers general, non-personalized information on typical causes, how clinicians evaluate hair loss, and which medical specialties may be involved. It does not provide individualized diagnosis, treatments, or medication advice.
Common causes of hair loss
Hair loss can stem from heredity and age, hormonal changes, nutritional deficiencies, stress, or environmental and styling-related damage. Androgenetic alopecia produces characteristic patterns in men and women. Telogen effluvium causes a diffuse increase in shedding and can follow severe illness, childbirth or major life events. Autoimmune alopecia areata leads to patchy or sometimes more extensive loss. Frequent chemical treatments, heat styling and very tight hairstyles can cause mechanical damage that accelerates hair loss.
How patterns help distinguish types
The distribution and speed of hair loss give important clues: diffuse thinning, localized bald patches, or broken hairs from pulling each suggest different causes. Male- and female-pattern hair loss tend to follow predictable distributions; sudden, widespread shedding points toward telogen effluvium. Examining the scalp, hair shafts and the course of change helps clinicians narrow possible causes.
Evaluation and which specialists to see
Primary assessment often starts with a family doctor or a dermatologist. Dermatologists examine the scalp and hair, and may request blood tests or trichoscopy. If hormonal or systemic causes are suspected, referral to endocrinology or hematology can be appropriate. Seek urgent medical attention or emergency services if hair loss is sudden and accompanied by high fever, widespread skin lesions, severe pain, or marked decline in overall health.
Everyday care and lifestyle measures
Gentle hair care—avoiding frequent harsh chemical treatments, high heat, and very tight styles—helps protect hair. Adequate protein, iron and overall balanced nutrition support hair health; discuss possible nutritional testing with a clinician. Choose hair products that suit your scalp sensitivity and avoid aggressive grooming practices. Before starting new supplements or treatments, consult a healthcare professional.
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