Hair Thinning in Midlife: What Is Behind It

Hair loss carries a weight out of proportion to its medical seriousness. It is also one of the areas where a proper workup most often changes the outcome.

The common patterns

Female pattern hair loss produces gradual thinning at the crown and a widening part, while the frontal hairline is generally preserved. It is influenced by androgens and by genetics, and the relative rise in androgen activity as estrogen falls is why it often becomes visible in midlife.

Telogen effluvium is diffuse shedding that follows a trigger by roughly three months: illness, surgery, significant weight loss, childbirth, severe stress, or starting or stopping a medication. It is dramatic, frightening, and usually self-limiting.

Sudden diffuse shedding usually has a trigger three months earlier. Gradual thinning at the part is a different problem with a different treatment.

What to rule out

• Iron deficiency. Ferritin can be low enough to affect hair while a standard blood count looks normal. Ask for ferritin specifically.
• Thyroid disease. Both underactive and overactive thyroid cause hair loss.
• Vitamin D deficiency.
• Protein intake. Frequently inadequate, particularly during weight loss.
• Medications. Including some blood pressure agents, antidepressants, and anticoagulants.

What has evidence

Topical minoxidil has the strongest evidence base for female pattern hair loss and is available without prescription. It requires consistent use for six months before results are fair to judge, and benefits stop when it is discontinued. Several prescription options exist for cases that do not respond. Correcting an underlying deficiency helps only if the deficiency is genuinely present, which is why testing before supplementing is worth the step.

What to be sceptical of

Biotin supplementation does nothing for hair unless you are deficient, which is rare, and it interferes with several laboratory assays including thyroid and cardiac tests. Mention it before any blood draw.