Allergies can provoke strong skin itching. While trying to relieve irritation, a cat sometimes will rub its muzzle against various objects or scratch it with its paws. This can lead to broken whiskers. The hairs lost this way will grow back as soon as the issue is solved.
Some medications can provoke the falling out of whiskers. You should consult with a specialist on this matter.
Bacterial, fungal, or parasitic skin infections can cause hair loss in cats. If the infection develops in the area where the whiskers grow, they may fall out along with other hair. These diseases can also cause severe itching, and, just like in the case of allergies, whiskers sometimes fall out due to friction. With skin infections, hair loss goes along with skin peeling and inflammation, as well as the formation of crust. Lost hairs should grow back once the infection is cured.
“Whisker fatigue” can cause constant pressure on the whiskers and the firing of the neurons that make that cat feel overstimulated. Bowls of the wrong size might be the reason for this condition. If your cat doesn’t like to eat out of its bowl or shovels the contents onto the floor, consult with the vet. You may need to buy a different bowl size to protect your pet’s sensitive whiskers.
Cat acne is caused by the overactivity of the sebaceous glands, most of which are associated with hair follicles. These glands are responsible for the production of sebum, which makes the fur waterproof, maintains the elasticity of the skin, and plays a role in scent marking. There are many sebaceous glands on the chin and lips of a cat, which is why animals rub their muzzle against various objects, marking them with their smell so often. Excessive production of sebum can cause the sebaceous glands to become blocked. And this, in turn, will lead to comedones. Whiskers and hair that have fallen out due to acne will grow back as soon as the issue is resolved.
A cat might lose its whiskers as a result of various traumas, like the following.

A fight: A cat’s whiskers might break during a tussle with another animal. This often happens to cats who walk outside.
Games: House cats can damage their whiskers during active play.
Fire: A cat might lose its whiskers if it comes into contact with fire, a stove, or another source of heat, and its whiskers will get burned. Burned whiskers usually have a curled appearance.

If your cat didn’t get injured during these situations, there is nothing to worry about — its whiskers will grow back again.

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