Hello, This may be is caused by urinary infection including kidneys infection or urinary stones so you should do urine analysis, urinoculture and kidneys ultrasound to rule these out which are most common causes. You should drink raspberry tea and plenty of water till you do tests. You should reduce salt in your diet as well, alcohol and carbonated drinks. In most cases this is self-limiting but sometimes antibiotics are required and more invasive tests such as cystoscopy or pyelography or CT scan. Less common causes include tumors, glomerulonephritis and metabolic diseases. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Iven Romic Rommstein, General Surgeon