You may have proteinuria if you have diabetes, nephrotic syndromes(in renal failure), hypertension, toxic lesions of kidneys, collagen vascular diseases(eg systemic lupus erythematosus), in dehydrated states, glomerular diseases, vigorous exercise, stress, drugs(eg NSAIDs, nicotine, penicillamine, gold and other heavy metals, ACE inhibitors, antibiotics, opiates especially heroin) and infections(eg HIV, syphilis, hepatitis, post-streptococcal infection).
Attribution: Avallain