Lesser-Known Causes of Hair Loss: What You Might Be Overlooking

When people think about hair loss, they often point to the usual suspects: genetics, postpartum, aging, or stress. But what about the causes that fly under the radar? If you’re noticing thinning or shedding and the common explanations don’t seem to fit, it might be time to dig deeper. Here are some lesser-known factors that could be affecting your hair health.

1. Nutrient Deficiencies You Might Not Expect

You’ve probably heard that iron and biotin are important for hair growth, but deficiencies in other nutrients—like zinc, vitamin D, and even protein—can trigger hair thinning, too. Low zinc levels, for example, can disrupt your hair growth cycle, while vitamin D plays a role in hair follicle health.

2. Thyroid Imbalances (Even Mild Ones)

You may know that severe thyroid conditions like hypothyroidism can cause hair thinning, but even subtle thyroid hormone imbalances can impact your hair. Sometimes, people with “normal” thyroid labs still experience hair loss if their levels are on the low or high end of the normal range.

3. Hormonal Birth Control Changes

Starting, stopping, or switching birth control can throw your hormones off balance temporarily, sometimes leading to shedding known as telogen effluvium. This isn’t always mentioned when people discuss birth control side effects, but it’s more common than you might think.

4. Scalp Conditions You Can’t See Easily

Sometimes the root cause (literally) is the scalp itself. Conditions like seborrheic dermatitis, psoriasis, or even a fungal infection can cause inflammation that damages the hair follicles over time. If your scalp feels itchy, flaky, or sore, it’s worth getting checked.

5. Autoimmune Conditions Beyond Alopecia Areata

Most people have heard of alopecia areata, where the immune system attacks hair follicles. But other autoimmune conditions like lupus, Hashimoto’s thyroiditis, or celiac disease can also lead to hair loss as part of their systemic effects.

6. Medications That Don’t List Hair Loss as a Major Side Effect

Some medications—including certain blood pressure meds, antidepressants, and cholesterol-lowering drugs—may quietly contribute to hair thinning, even if it’s not listed as a primary side effect.

7. Excessive Vitamin A

You hear a lot about vitamin deficiencies causing hair problems, but too much of certain vitamins—especially vitamin A—can also trigger shedding. Supplement with caution!

8. Tight Hairstyles & Hair Habits

Known as traction alopecia, hair loss from tight buns, braids, ponytails, or frequent heat styling often sneaks up on people. If you notice short pieces in the back when you put your otherwise long hair in a ponytail, surprise – that is likely breakage, not new growth, and a sign to loosen that elastic!

What to Do If You’re Noticing Hair Loss

The first step? Don’t panic. Hair loss is often treatable, especially when caught early. See a board-certified dermatologist who can help pinpoint the cause and create a treatment plan tailored to you. Blood work, scalp exams, and a detailed health history can help solve the mystery—and put you on the path to healthier, fuller hair.