Some of us notice an increase in hair loss during certain times of the year. This is a natural phenomenon that occurs typically in the late summer and early fall months. although it can be alarming seasonal shedding is usually temporary and part of the normal hair growth cycle. What is happening here is the hair is entering the telogen phase of the hair growth cycle. This is the phase where the hair falls out and the follicle rests. It is a natural process that does not result in you losing all your hair.
On average people lose about 50 to 100 hairs per day but during seasonal shedding this number can increase up to 150 or more hairs. The exact reason isn’t fully understood but there are a few theories, some supported by research. During the summer more hair follicles are thought to remain in the anagen phase or growth phase to protect the scalp from UV rays and regulate body temperature, as the seasons change many of these follicles simultaneously shift into the telogen phase leading to an increase in shedding.
Some scientists believe seasonal shedding is an evolutionary trait that is an inherited factor where during warmer summer months humans retain more hair to shield their scalps and during the winter months the body may shed hair to conserve energy and allow for a phase of rest.
The amount of sunlight exposure can impact hormones like melatonin and prolactin which may influence the hair growth cycle. As daylight hours decrease in the fall, hormonal shifts may push more hair follicles into the telogen phase. Prolonged sun exposure in the summer can weaken and damage hair potentially triggering telogen effluvium, which is temporary hair loss. Increase sweating which causes an exposure to salts and exposure to chlorine during summer months may also irritate the scalp and contribute to hair loss.
During the telogen phase it is normal for one to notice more hairs on their pillow or perhaps in the hairbrush or shower however, it’s important to differentiate between seasonal shedding and chronic hair loss. Seasonal shedding is a temporary increase in hair loss for a few weeks typically occurring around the same time each year. Chronic hair loss is caused by genetic factors such as sensitivity to DHT and exacerbated by other factors such as hormonal imbalances, medical issues, medications, and environmental issues. Chronic hair loss continues throughout the year while seasonal shedding usually lasts between two to three weeks and on occasion can last longer.
With seasonal shedding the density of your hair remains relatively unchanged however with chronic hair loss the density of your hair becomes less and less until you notice a considerable thinning of the hair.
There are steps you can take to manage seasonal shedding.
Maintaining a healthy diet and focusing on nutritional whole foods rich in zinc, iron, biotin and vitamin D all support healthy hair growth. Protein rich foods are essential for follicle health. Protect your scalp from UV exposure by wearing hat. Meditation, yoga and exercise will help keep stress levels in check and a reduction in stress will also help you keep your hair. Limit the use of heat styling hair dryers and hair irons and avoid harsh clarifying shampoos that strip the hair of its natural oils. Consider topical treatments like minoxidil, hair oil treatments and scalp serums to promote hair and scalp health.
If you notice the shedding lasts longer than three months or is leading to noticeable thinning and bald spots make an appointment with a hair loss specialist. If the shedding is accompanied by scalp irritation, redness or flaking it may be time to consult a doctor to help identify whether your hair loss is actually seasonal or caused by underlying factors like androgenic alopecia, hormonal imbalance and/or nutritional deficiencies.
The seasonal shedding of hair is a normal temporary phase of the hair growth cycle that tends to peak at certain times of the year and there is no cause for alarm. Focus on caring for your scalp and by incorporating a balanced diet, healthy habits, stress reduction and exercise, you can minimize the effects and assure your hair stays strong and vibrant year-round.
