Summer can particularly affect certain people who have a hot constitution, known as “pitta”. These are people who are sensitive to heat and tend to sweat very easily; they are vulnerable to scalp infections at this time of the year that causes hair loss due to summer. The main cause behind summer hair loss. The UV rays of the sun can do a number on your hair by sucking out every trace of moisture in it, and make your mane dull, dry, and discolored. In addition to this, dry hair is more brittle, which is why it breaks easily.