Why pulling hair out of head is hurt but not cutting?

Hair pulling hurts because it damages the hair follicle, which is the root of the hair. When hair is pulled out, it can tear the follicle, which can cause pain, bleeding, and inflammation. In some cases, hair pulling can also lead to scarring and permanent hair loss.

Cutting hair, on the other hand, does not damage the hair follicle. This is because the hair is made of dead cells, and when it is cut, it simply separates from the follicle. As a result, cutting hair does not cause pain or bleeding.

Here are some of the reasons why pulling hair out of the head can hurt:

* The hair follicle is a living structure. It is made up of cells that are constantly dividing and growing. When hair is pulled out, it can damage these cells and cause pain.

* The hair follicle is connected to the nervous system. When hair is pulled out, it can刺激 the nerves in the scalp, which can cause pain.

* The hair follicle is surrounded by blood vessels. When hair is pulled out, it can rupture these blood vessels and cause bleeding.

In addition to pain, hair pulling can also cause a number of other problems, including:

* Infection

* Scarring

* Permanent hair loss

If you are experiencing hair pulling, it is important to see a doctor to rule out any underlying medical conditions. Treatment for hair pulling may include therapy, medication, or a combination of both.