You must disclose at the time of booking any medical condition that could affect your ability to do the Himalaya trekking. The Himalayan Smile Treks advise to do trek who has with heart conditions, knee problems, severe asthma or pregnant should not participate in the trek. The Himalayan Smile Treks could not be responsible in Himalaya trekking due to the lack of the medical facilities any problems due to your special dietary requirements or medical condition