Varies: There is no specific dangerous heart rate during exercise. How fast your heart beats with exercise depends on a number of factors, especially your conditioning. If you are healthy, a heart reate in the 170's or even higher may be ok and tolerated.
Motion sickness caused by video games, sometimes called simulator sickness, is caused when there is a disconnect between what your eyes are seeing and what your body is feeling.
Radiation sickness is caused by a high dose of radiation, and causes vomiting, diarrhea, hair loss, and more. Anemia, hemolytic. Hemolytic anemia occurs when there aren't enough red blood cells in the blood. Hypothyroidism (infant and child) Hypothyroidism in children can cause delayed growth, weight gain, a puffy face, a large tongue, and more. Pseudohypoparathyroidism Pseudohypoparathyroidism is a rare inherited condition that can lead to cramps, muscle spasms, and more.