The 50-year-old actor, who is playing a wrestler in the sports drama, said he will resume shooting for the film after a week's bed rest.
"Hey guys its not such a major injury. My back muscle has gone into a spasm. A week of rest and I will be back on shoot," Aamir posted on Twitter.
Earlier, the actor's spokesperson told PTI, "When Aamir was shooting a wrestling scene in Ludhiana and he injured his shoulder badly. He was taken to a hospital there and was asked not to travel.
"Dangal", directed by Nitesh Tiwari, is based on the real life story of wrestler Mahavir Singh and his famous daughters Geeta and Babita Phogat and the relationship between them.