The lawyer has reportedly been diagnosed with bipolar disorder, a mental condition which can cause a person to swing between mania and depression.
Mr Ravi was diagnosed with bipolar disorder in 2006 and was suspended from practicing for a year.
Since then, he had been required to regularly see his doctor and submit regular medical reports.
Mr Ravi said he is surprised by the sudden order to stop practice.
He explained that he saw his doctor last week and submitted his monthly medical report a fortnight ago.
He said that his doctor did not certify him unfit and he is consulting his psychiatrist today to sort the matter out.
Mr Ravi is handling several high profile cases at the moment.
These include representing socio-political activist and blogger Roy Ngerng in the defamation suit against Prime Minister Lee Hsien Loong, and another case involving Roy Ngerng and 5 others relating to Public Nuisance.
The news of the order for M Ravi to stop legal practice temporarily comes after video of him surfaced online accusing his own client, Roy Ngerng of “swindling” money.
Mr Ravi is also the solicitor in charge of the case of the wife of one of the three men arrested during the Thaipusam incident.
The most recent case, brought forward by R Angelina in regard to the Thaipusam case also listed the Attorney-General, the Hindu Endowments Board and Law Minister K Shanmugam in the case.