2. Watery eyes
Numerous conditions and illnesses can cause the eyes to water. Tears not only maintain hydration within the eyes but also function as a line of defense against infections. Watery eyes can be triggered by allergic reactions and sinus problems. It might also be caused by the lack of lubrication in the eyes or, in other words, dry eyes. It is important to note, however, that watery eyes can be triggered by a number of other conditions such as eye strain, eyelid inflammation, conjunctivitis, and trichiasis as well as environmental factors like weather conditions, bright light, and smog.
Many of the same nerve fibers (axons) that are responsible for the coughing reflex are also used when a person cries or laughs. This explains why coughing fits can cause the eyes to water. This symptom is seldom serious and normally present along with other symptoms. It can easily be treated even without medication.