If you’re experiencing hair loss or hair thinning, you’re not alone. It can be frustrating, especially when you’re struggling to pinpoint the cause. The good news is there is plenty of haircare out there that can help target and treat the issue. However, not all hair growth products are created equal, which is why E! News spoke with board-certified dermatologist Dr. Sheila Farhang to discover the cause of hair loss and hair thinning plus the best products for hair growth.

What is the cause of hair thinning and hair loss?

In order to properly address your hair concerns at the root (pun intended), it’s essential to first answer the question: is there a difference between hair thinning and hair loss? According to Dr. Farhang, “hair thinning is technically a decrease in the actual strand width causing breakage” while hair loss refers to a “decrease in density of hair on the scalp.”

The cause of hair thinning and hair loss is multifactorial, says Dr. Farhang. That means there are a number of reasons why you may be experiencing these symptoms. 

When it comes to hair loss, the most common is genetics. However, it can also be caused by other factors, including “hormonal changes (i.e. giving birth or changing birth control pills], age, stress, vitamin/nutrient deficiencies, medical conditions, [or] medications that cause an excess of hair loss.”

While hair thinning can also be caused by these factors, Dr. Farhang notes that “I often see it caused by certain hairstyling practices.” This might include products containing harsh chemicals and irritants or poor hair practices like tight buns, hair dye and bleach, and hair extensions.