Megastar Amitabh Bachchan, who underwent tests for his stomach ailment, has been advised few days of rest and is under medical observation.

"The tests have been conducted. They do not show anything alarming, but the symptoms persist, albeit on a lesser scale than last time," Bachchan wrote on his blog.

The actor was scheduled to travel to Singapore to be with his friend and Samajwadi party leader Amar Singh, who will undergo surgery for a kidney transplant.

His wife Jaya, son Abhishek and daughter-in-law Aishwarya are already in Singapore.

"In this hour of trial for him, I needed to be there, but the doctors advised a few days of rest and observation for me," he said.

"I understand their concern. It would not be appropriate to find myself in trouble in an alien land, even though I am certain the medical facilities there shall be more than adequate. But to be in the vicinity of home and with people who know my intricate system is not to be ignored," the actor wrote.

Bachchan, who was shooting in London for "Pa" returned home two days ago, suffering a stomach pain similar to the one he experienced on his last birthday, when he had to be hospitalised for a week.