and remember to take warm clothes. Altitude sickness is not a problem in Kaaza and Spiti. The highest elevation on the whole road is at Kunzum pass(4590 m), but you do not feel lack of oxygen until you are hiking. But if you are very new to elevation, then keep the pills, and take it one day prior to you visit to the the elevated place. Larger chances of this sickness happening are in the Ladakh region. Following you for your traveling experiences.
RE: My Upcoming Solo Travel to Himalaya mountains in India in 10 days but I am having mixed feeling