The unrelenting heatwave sweeping large parts of the country has claimed at least 110 lives and left over 40,000 people grappling with suspected heatstroke between March 1 and June 18 this year, Health ministry sources said on Thursday.

Uttar Pradesh is the worst-affected having reported 36 deaths followed by Bihar, Rajasthan and Odisha, according to the data compiled under the National Heat-Related Illness and Death Surveillance by the National Centre for Disease Control (NCDC).