Objective:To evaluate the diseases pattern among pilgrims attending the 2 Holy Mosque (Haram) Health Care Centers during the Hajj season 2013 (Hijra 1434).Methods:In this cross-sectional study, data was collected from 2 medical centers located in the Holy Mosque in Makkah city, Saudi Arabia, from the first of Dhul-Hijjah to sixteenth Dhul-Hijjah 1434. The present study was completed in 16 days (6th October to 21st October 2013).Results:Over 16 days, 1008 patients attended the medical centers during Hajj 1434, (2013), out of which 554 (55%) were males and 454 (45%) were females. Most of the patients were Egyptians (n=242, 24%), followed by Saudis (n=116, 11.5%), Pakistani (n=114, 11.3%), Turkish (n=50, 5%), and other nationalities (n=404). According to age distribution, mostly were in the 51-60 years age group (n=237, 23.5%), followed by other age groups. Out of 1008 patients, 842 (83.5%) patients were treated and subsequently discharged, while 166 patients (16.5%) were referred to the tertiary centers. According to the diseases pattern, most of the patients were suffering from respiratory problems (n=177, 17.6%) followed by skin diseases (n=158, 15.7%), gastrointestinal tract (GIT) diseases (n=133, 13.2%), and others.Conclusion:Most of the patients were suffering from respiratory problems followed by skin and GIT diseases, and <25% of patients were referred to tertiary care centers.