hello dr my uncle is suffering from burining while urination and also he has to urine with 30 minutes ftrequently,

 hello dr my uncle is suffering from burining while urination and also he has to urine with  30 minutes ftrequently,

after urination drop by drop pain will comedown again after 30 minutes pain will start, then he has to go bath room try for few minutes the drop by drop urin passes then pain will go down , what is the desease how to cure it