Other causes of nausea include side effects from medications, pain, pregnancy and morning sickness, seasickness, viral infection, alcohol toxicity, and disease of the brain, esophagus, stomach, gallbladder, liver, pancreas, and intestine.
so roosevelt was able to win more than two terms because there was not yet a formal term limit on the presidency and the unique conditions when he ran for his third and fourth terms made his arguments for breaking with tradition acceptable to a majority of american voters
The 22nd amendment states a president cannot serve more then two terms. FDR was elected to serve four terms. After FDR's death the 22 amendment of the constitution was ratified and limited presidents to serving two terms. FDR was the only one to serve more than 2 terms.