Patients with IgA nephropathy stage 4 can consume watermelon appropriately if they do not have diabetes, hyperkalemia and severe edema, because watermelon is not a dietary contraindication for IgA nephropathy patients. Dietary advice for patients with IgA nephropathy is generally low-salt, low-fat, high-quality and low-protein diet. Watermelon is a kind of fruit with high content of water, sugar and potassium, so it can be consumed appropriately to replenish the body’s needs, but note that if accompanied by diabetes mellitus, hyperkalemia or severe edema, consumption of watermelon may further aggravate the condition, which is generally not recommended to be consumed at this time. In addition, IgA nephropathy patients should not consume watermelon in excess, so as not to aggravate the burden on the gastrointestinal tract, which is not conducive to the recovery of the body. If you suffer from IgA nephropathy, it is recommended to seek medical treatment as soon as possible to avoid delaying the condition, and it is also recommended to eat under the guidance of dietitians.