I have heard some of my patients reporting that they lose hair during certain seasons. Humans have asynchronous hair cycling, which means that we generally shed uniformly over the entire hair cycle of about 36 months. We lose about 100 hairs per day and replace that number each and every day. Animals have synchronous hair […]
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What you say is logical, it is just not what we normally see in humans. Why humans have developed asynchronous hair growth, why we do not grow and shed hair all at once and the evolution of this is not known. What you are suggesting is that in you there is some seasonal variation in […]
I am beginning to notice a trend of accelerated hair loss during certain times of the year, particularly in the winter months. I’m from western Pennsylvania and as such we experience all four seasons, with winters fluctuating from brutal to mild all in the same season. I’ve noticed that my hair looks much more thicker […]
Humans lose hair asynchronously, which means we don’t shed with the seasons but rather have a fairly constant rate of shedding at about 100-150 hairs per day for the typical Caucasian. Asians shed less because they have less hair than Caucasians by 20%.
Let’s talk hair physiology. assuming you are an average Caucasian male with a typical hair count of 100,000 hairs on your head, and your hair cycles every three years and the telogen cycle is 3 month, then simple match brings us to 100 hairs per day go into telogen while another 100 hairs per day […]
You should get baseline measurements on your hair bulk to determine the significance of the shedding, and quantify just how much hair you are losing over time. As for a seasonal shedding, I’ve had a few reports emailed to me from readers over the years about this, but there is no medical explanation that I […]
In some animals, the fur coats get thicker in the winter. We have never recognized that hair cycles change based upon seasons, so the official answer to your question is that no, it should not get thicker in cold weather. That being said, many patients have told me that their hair appears thicker in the […]
There are no studies that I am aware of that look at a relationship between hair texture and weather. I think it is more of something we take as common sense that when the weather is cold and dry, our hairs and skin may be affected. If your hair is dry in the winter months, […]
Hair growing faster/longer in the summer isn’t a proven fact, but if it is something you notice I can’t dispute it. I’ve read all kinds of theories about why hair might grow faster in the summer (if so, likely due to hormones), but some people believe that hair actually sheds at a higher rate in […]
I would want to know if you are using a tight hat or if you have done anything different during this time period that might cause the hair loss you see. Normally, humans have asynchronous hair cycling, which means that we lose on average 100 hairs per day and regrow the same numbers of hairs. […]
Your haircut didn’t contribute to your hairline changing. What it sounds like (without photos, I’m just making an assumption) is that your hairline is starting to mature. This is premature around your age, but it happens. Your new hairstyle might be contributing to your hair looking thinner on top, but I don’t know enough about […]
The hair pull test should be done by the physician, and not by the patient, as it is more complex than the name makes it out to be. Just pulling on some hairs and seeing clumps of hair fall out does not mean you have a positive hair pull test. The hair pull test is […]
Humans have asynchronous hair growth, which means that we do not shed in seasons, but do so relatively uniformly over the year. I can not explain your situation, but an examination is a good start, because your time frame view may not go back to every winter.
The cause of hair loss in women is not as straight forward as it is in men, who usually follow a specific male pattern balding. Male pattern balding involves hair loss only on the front, top, and crown of the scalp. Male pattern balding spares the hair in the back and sides of the scalp, […]
It is normal to lose 100 to even 200 hairs a day (though the average would be closer to 100, I’d say). As hair falls out, there are hairs that are also starting to grow. Hair may also grow in cycles and you may notice more hair falling out at different phases and seasons of […]
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