- polycystic ovarian syndrome
- Cushing's syndrome
- metabolic syndrome
- depression or other psychiatric illnesses that may cause overeating
More commonly, any hormonal conditions that reduce the body's ability to metabolize and utilize nutrients, including (for some women) menopause - can cause obesity. Aging itself reduces the efficiency of digestive and metabolic function. If the caloric intake is not adjusted for the normal or frequent changes in metabolism that can occur with aging, excess weight gain and obesity can occur.

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You are asking what diseases might cause obesity, not what diseases might result from obesity.
Obesity is caused by consuming more calories than your body needs to function - resulting in increased fat stores. There is a lot of research surrounding contributing factors (genetics, metabolic dysfunction, viruses, etc.) but at the end of the day, more energy must be taken in than is needed to gain weight. Granted, there may be compulsive factors contributing to that consumption (or lack of movement), but the root is still caloric excess.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.