Brazilian singer Milton Nascimento has undergone a heart procedure in a bid to identify the source of his recent health problems.

The Maria, Maria hitmaker was admitted to the Heart Institute (Incor) in Sao Paulo on Monday (13Oct14) to undergo an angiogram of the coronary arteries.

A statement from a representative at the hospital reads: "The diagnostic procedure is part of the sequence of tests cardiology and general assessment that the singer has been submitted in Incor since August this year, co-ordinated by Dr. Sergio Timerman."

Nascimento will reportedly remain hospitalised until Wednesday (15Oct14).

This is the second hospitalisation for the singer this year (14) - he was admitted to a facility in August (14) after falling ill during a performance with rapper Creole in Brazil.