The condition of eminent cartoonist RK Laxman, who is being treated for lung infection and kidney problem at a hospital in Mumbai, remains critical but stable.

86-year-old Laxman, who was admitted to the Breach Candy Hospital on Sunday after suffering three mild strokes, is responding to medicines and is stable but the next two days are crucial, doctors attending on him said on Tuesday.

Laxman is being treated for lung infection and kidney problem besides being treated for stroke, the doctors said.

Laxman's daughter-in-law Usha Srinivas, who visited the cartoonist in the morning, said, "There is slight improvement in his health, but he is not in a position to talk."

Laxman suffered a stroke on Thursday at his residence and subsequently had two more strokes while he was admitted at Sahyadri hospital in Pune. On Sunday, he was brought to Breach Candy Hospital by an air ambulance by his family physician and friend Dr Vinkar Gunjal.