Hair loss only on one side of your head could have several possible causes. Finding and treating the underlying problem gives you the best chance to regrow your hair. Consult your stylist or doctor if the amount of hair loss is noticeable or significant to you.
Causes of Localized Hair Loss
There are many causes of hair loss, some of which lead to certain patterns of loss, which may be in patches or generalized thinning. For example, thinning of hair on the top (crown) of the scalp occurs in women with female hereditary pattern baldness. There is also the familiar male pattern hair loss.
The following are some of the problems which could explain your one-sided hair loss:
Trauma: Hair loss can happen from trauma and lead to inflammation or scarring of your scalp. For example:
- Hairstyles such as tight braids that put more traction on one side of your head than the other, especially with African American hair
- Hair treatments, such as hair relaxers, perms or hair coloring that happen to burn or inflame one side of your hair or scalp more than the other
- Hair styling implements, such as hot curling irons or hair straighteners, which can potentially cause more damage to one side of your hair than the other, depending on how you are applying them
- One-sided traction: Some people subconsciously pull on parts of their hair only on one side while working or resting. This can weaken and break off hair anywhere along the shaft or from the follicles. The extreme of this is a psychiatric disorder called trichotillomania - a compulsive, constant pulling on the hair.
- Sleeping on one side: Constant pressure and friction from your pillow on one side of your head while sleeping can potentially weaken the hair on that side and cause hair breakage and loss.
- Systemic causes: Medical problems, in general, lead to hair loss all over the head but might preferentially and randomly start and attack weaker hairs or follicles on one side or the other. These include:
- Age: You hair thins out as you grow older and there is every chance that this could start on one side of your head before the other.
Localized scalp problems: These include diseases which might affect patches of the scalp and cause you to scratch and break your hair strands, or they cause scarring of the scalp and loss of hair follicles. These problems include:
- Lichens planus, a skin disease of unknown cause
- Psoriasis might affect just one part of the head and cause scarring and loss of hair
- Tinea capitis (or scalp ring worm) which is more common in children, or other fungi could cause a localized scalp infection leading to patchy hair loss on one side of the head only
- Circulation problems: It is possible that a problem with circulation or inflammation in blood vessels that supply blood and nutrients to your hair follicles on one side of the head could cause your hair to thin out on that side.
Treatment of One-Sided Hair Loss
The treatment of hair loss on one side of your head, like any other pattern of hair loss, depends on the cause. This is why it is important to try pin down the problem. Based on the cause, management includes the following:
Treating any underlying disease that may have caused you to lose your hair
- Stop all traumatic hair treatments, hair grooming, hair styles, and products
- Start out the night by sleeping on your side opposite to your hair loss even if you toss and turn all night. Return to your "good" side if you wake up and find yourself on the "bad" hair side. Try, if possible, to alternate sleeping sides when your hair regrows.
- Temporary hair extensions can even out your look until your hair grows back. However, be careful about worsening the problem by causing more traction on your scalp.
- If necessary, you can use a wig when you go out until your hair starts growing back
- Your doctor might recommend medications to treat your hair loss if necessary, such as:
- Topical minoxidil (Rogaine)
- Oral or topical medication or shampoo to treat any fungal infection
- Localized steroid scalp injections to treat psoriasis or any autoimmune causes can help hair regrow
Your doctor will recommend the best course of treatment based on the explanation for your hair loss. You can also try natural hair loss treatments to help you regrow your hair.