Summer is reigning and how! Humidity levels soared to uncomfortable heights on Sunday and Monday, going as high as 89% in Colaba.

The suburbs too were sultry, with the Indian Meteorological Department (IMD) recording humidity at 76% on Monday morning. By evening, it was small mercies as the levels eased to 75% in the suburbs and 80% in Colaba, but not before leaving many sweating within minutes of stepping into the open.

Mumbaikars, or at least those who have access to it, are remaining closeted within air conditioned spaces, avoiding going out.

Santa Cruz resident Shreya Roy said, "I had free passes to a stand-up comedy show this Sunday, but to even step out and take an autorickshaw to the venue in Bandra seemed so daunting that I ended up not going."Head of the forecast department at the IMD VK Rajeev said, "Humidity has risen due to certain passing winds, but it will not last more than 24 to 48 hours."

Doctors, however, are already urging people to spend as less time as possible under the sun and use sun protection when they venture out. More people may be attacked by serious diseases, such as dehydration, gastroenteritis and jaundice, they warn.

Dr Subodh Kedia, family physician from Bandra, said, "Low blood pressure, muscle cramps and dehydration are common in summers, but this time the weather has been harsher. It is hot and humid, leading to excessive sweating and imbalance of electrolytes in the body, which help maintain good health. It is important to keep oneself hydrated."

According to doctors, most cases of low blood pressure and muscle cramps are seen among those who are into field work, like marketing professionals. "These are common ailments that can be easily avoided. People should hydrate themselves continuously and ensure that while doing so they don't consume cold drinks," said Kedia.

A high number of cases of gastroenteritis too are being seen as people continue to eat outside food and drink unhygienic juices.

Dr Anil Ballani, consulting physician at Lilavati hospital, said, "Viruses thrive in hot and humid weather and that's why we are seeing a rise in respiratory infections, gastroenteritis and chicken pox too."