There may be many reasons for a cat to suddenly make a strange whining sound. One common situation is when a cat enters estrus. Cats in heat may make a cry-like cry at night as a way for them to find a mate. Another possibility is that the cat is feeling unwell or frightened, such as pain, illness, hunger, boredom, or loneliness.

If you find that your cat suddenly makes such noises, here are some possible solutions:

1. Distraction method: When the cat is in heat, you can try playing Play light music to attract their attention, or provide your cat with food or interact with it using a cat teaser stick to divert their attention. 2. Manually relieve the cat’s estrus symptoms: Owners can try to gently massage the cat’s butt area, which can help relieve the discomfort caused by estrus. At the same time, massage the depressed areas on both sides of the base of your cat's tail. When you feel the muscles pulsing, gently massage these muscles. 3. Use forbidden love powder: If none of the above methods are applicable, the owner can choose to give the cat a forbidden love powder during the period of estrus, such as the cat wants to lose love powder. This product can be given directly to cats or mixed into their food. Please note that every cat’s personality and reactions are different and it may be necessary to try different methods to find the solution that works best for your cat. If your cat’s strange meowing persists or is accompanied by other abnormal behaviors, it is recommended to contact a veterinarian for examination in time.