A wearable monitoring apparatus for monitoring at least one biological parameter of an internal tissue of an ambulatory user. Said wearable monitoring apparatus comprises at least one transducer configured for delivering electromagnetic (EM) radiation to said internal tissue and intercepting a reflection of said EM radiation said reform in a plurality of transmission sessions during at least 24 hours, a processing unit configured for analyzing respective said reflection and identifying a change in said at least one biological parameter accordingly, a reporting unit configured for generating a report according to said change, and a housing for containing said at least one transducer, said reporting unit, and said processing unit, said housing being configured for being disposed on said body of said ambulatory user.