Frequent urination only at night, can this be caused by heart failure or kidney disease?

Three Main Causes: 1. Overactive bladder, from several secondary causes (nerve problems, prostate problems, infection, bladder irritants) or just plain oab. 2. Overall increased urine production (diabetes, diuretics, brain injury etc.). 3. Increased nighttime urine production (sleep apnea, age, fluid retention). Management focuses on finding an underlying problem. In true oab, medicines to calm the bladder are used.

Urinating often: There are several causes for getting up at night to urinate (u). If you are walking around and your ankles are swollen at the end of the day, you have edema. The fluid in your legs gets back into the circulation which is why you u at night. See a cardiologist for a physical examination and have some blood taken to arrive at the answer to your question.