1. Improper diet: If a British Shorthair cat eats dry food for a long time, it will not drink water on its own. Over time, the dry food will ferment in the cat's body, and without enough water, it will cause internal heat.
Some pet owners spoil their cats too much, often feeding them meat to cater to their appetites while neglecting fruits and vegetables. This leads to a deficiency of vitamins and water in the cat's body, causing it to become dehydrated and suffer from internal heat. Pet owners need to adjust their cats' diets appropriately. 
2. Eye inflammation: When a British Shorthair cat has eye inflammation, its eyes will not only produce more discharge, but also secrete tears continuously, causing inflammation.
Besides dietary issues causing internal heat, other possible causes include eye irritation from foreign objects or ingrown eyelashes. If it's due to dietary issues, adjust the cat's diet accordingly. If it's caused by foreign objects or ingrown eyelashes, it's recommended to consult a veterinarian to remove them. Consider using Taiqu cat eye drops to care for the British Shorthair's eyes.
3. Be alert for feline rhinotracheitis. Pet owners also need to be alert for feline rhinotracheitis in their cats. If a cat has feline rhinotracheitis, its eyes will not only have a lot of eye discharge, but also secrete a lot of tears. It will also sneeze, have a runny nose, and its body temperature will rise, sometimes resulting in fever. It is necessary to take the cat to the vet in time for antipyretic injections, followed by lysine administration and the use of cat eye drops for care.
Pet owners can actually wash their cats' faces every day by gently wiping them with a damp towel to remove dirt from any wounds or irritations.
