Is heat intolerance a common symptom in ME/cfs? It's currently very hot in my country and i just can't cope with it. Every year the heat intolerance becomes worse! It's not just the weather but also hot food or a warm shower that makes me feel ill. One thing that really stands out is the vasodilation in my hands and feet, that in turn worsens my orthostatic intolerance. I also urinate more than normal and my muscles hurt. It's like my muscles are completely drained from any fluid. I just had a cramp in my neck! Magnesium doesnt help and makes the vasodilation worse. ALso my neck is so stiff and hurts, like someone just hit me in the neck / base of skull. So, anyone else with really bad heat intolerance?