There are many different reasons cats cry, and if you have a crying cat, you will need to make an appointment with your veterinarian. From that point, your veterinarian will need to discover what is bothering your cat. There will be several different factors that he will be looking for which may include:
Aging
As cats become older, they may suffer from loss of vision or hearing. The loss of these two senses may cause your cat to cry more often; a period of adjustment is expected.
Arthritis
Aging cats can also develop joint pain, or arthritis. This degenerative condition affects the cushioning material in between their joints, causing pain when getting up from a resting position or as they lie down.
Infection
There are many types of infections such as a urinary tract infection, skin irritation secondary to flea bites, and upper respiratory virus. Many of these infections are treatable, but they can be quite painful or distressing. Cats may cry due to pain from infection.
Anxiety
Overly anxious cats may cry out for more attention. When cats feel anxious, such as when a new pet is introduced into the home or if their environment has changed, this may make them more vocal.
Bowel Disorders
If your cat is suffering from bowel disorders, such as constipation, inflammatory bowel disease or other illness, it can be painful and they may cry more often, especially when using the litterbox.