13 Best Shampoos for Hair Growth 2024, According to Dermatologists and Testers

Factors like age, genetics, hormones, medical conditions, and stress can all contribute, Dr. Green says. Regarding age, as we grow older, “our hair follicles’ size decreases, leading to thinner, shorter hairs,” she explains. “This natural aging process can be exacerbated by genetics, as patients can be genetically more prone to thinning and hair-follicle miniaturization.”

Hormonal changes, like those that happen during pregnancy, postpartum, or menopause, can also play a role, and so can medical conditions, like thyroid and autoimmune disorders. Moreover, chronic stress can be to blame, as it can “trigger an immune response that attacks and damages hair follicles, causing hair loss,” Dr. Green says.

Metabolic problems, such as iron deficiency anemia (a condition whereby you don’t have enough iron in your body), are another issue. “Hair is just a protein, but it’s the least important protein your body produces,” Dr. Davis says. So, if your body doesn’t have all the vitamins and amino acid ingredients it needs to create proteins, then hair “is the first thing your body will skimp on.”

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