By 1962, Korolev's health problems were beginning to accumulate and he was suffering from numerous ailments. He had a bout of intestinal bleeding that led to him being taken to the hospital in an ambulance. In 1964 doctors diagnosed him with cardiac arrhythmia. In February he spent ten days in the hospital after a heart problem. Shortly after he was suffering from inflammation of his gallbladder. The mounting pressure of his workload was also taking a heavy toll, and he was suffering from a lot of fatigue. Korolev was also experiencing hearing loss, possibly from repeated exposure to loud rocket-engine tests.