It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that a Bedouin came to the service of the Holy Prophet (peace and blessings be upon him). The Holy Prophet (peace and blessings be upon him) asked him, "Has Umm Mildam ever seized you?" He said, "What is Umm Mildam?" The Prophet replied, "It is the heat between the flesh and the body." He said, "I have never felt this in my body." Then the Holy Prophet (peace and blessings be upon him) asked, "Has Suda’ ever afflicted you?" He asked, "What is meant by Suda’?" The Holy Prophet (peace and blessings be upon him) said, "It is the veins that run in a person's head (and because of them, there is pain in the head)." He said, "I have never felt this pain in my body." When he left, the Holy Prophet (peace and blessings be upon him) said, "Whoever wants to see a person of Hell, he should look at this man."