Melatonin
Low levels of melatonin are another cause of ulcers. Low lighting decreases the production of melatonin in the pineal gland. Nevertheless, due to changes in lifestyle, such as working late at night, using artificial lighting and so on can make the body produce less melatonin than normally required.
Reducing the production of melatonin may cause a number of health problems, such as ulcers, sleeplessness, and melanomas (skin cancers). In addition, even a small increase in the levels of melatonin can have a dramatic effect in both healing and prevention of ulcers caused by stress.