Normal. It is normal for cats to go into heat once every seven days, especially female cats. If the cat is in estrus but has not been mated, it will start to have estrus every 2-3 weeks, and then the intervals will become shorter and shorter, and it will become estrus every other week, so it is normal. Cats in estrus will meow until they need it. Usually when cats are in estrus, they will have loss of appetite, lethargy, anxiety, etc. If you don’t want to breed kittens, it is best to have them neutered after they are in estrus. If they are in heat for a long time and cannot be mated, and if they are not neutered, they are prone to diseases.

Performance of cats in estrus:

1. During the estrus period, the appetite of female cats will decrease significantly. Some severe cats will not even eat, drink or sleep, so they will not be in estrus for a long time. Neutered female cats tend to be underweight.

2. After a sexually mature male cat passively goes into estrus, in order to fight for the right to mate, he will urinate in the room to mark his territory.

3. Female cats in heat will become very clingy and love to rub against people or various objects that are easily accessible.

4. It is a typical characteristic of female cats to howl heartbreakingly, especially they like to meow at night and keep calling all night long. Therefore, female cats in estrus must take good care of them. The owner must also endure the emotions patiently.

5. In order to attract the owner's attention, they will become extremely clingy and may rub against you constantly or lie on the ground and roll around.