Chronic stress, or a constant stress experienced over a prolonged period of time, can contribute to long-term problems for heart and blood vessels. The consistent and ongoing increase in heart rate, and the elevated levels of stress hormones and of blood pressure, can take a toll on the body.
Excess Tearing. The most common cause of tear stains in dogs is excess tearing or epiphora, which makes the hair and skin around the eyes damp. This can lead to the growth of bacteria and yeast. Red yeast, which produces a reddish brown discoloration of the face, is a common cause of tear stain problems.
Common causes of increased tear evaporation include: 1  Wind, smoke or dry air. 2  Blinking less often, which tends to occur when you're concentrating, for example, while reading, driving or working at a computer. 3  Eyelid problems, such as out-turning of the lids (ectropion) and in-turning of the lids (entropion).his mixture helps make the surface of your eyes smooth and clear, and it helps protect your eyes from infection. For some people, the cause of dry eyes is decreased tear production. For others it's increased tear evaporation and an imbalance in the makeup of your tears.