Magen David Adom treated more than 170 people who fainted or felt weak, dizzy or confused during the Tisha Be’Av fast on Tuesday.
The numbers were higher than usual because of the heat.
Sixty-six fainted and six suffered from dehydration.
No severe cases were recorded.
Large numbers of medics and paramedics were on duty around the country, especially at the Western Wall plaza in Jerusalem where thousands of mourners over the destruction of the two Temples prayed.
Dozens more people who felt unwell during the fast were treated at Terem clinics.