Why did Abbe suffer an apoplatic attack that paralyzed his arm??

From the text:

“The last attack I had,” said he, “lasted but half an hour, and after it I was hungry, and got up without help; now I can move neither my right arm nor leg, and my head seems uncomfortable, which shows that there has been a suffusion of blood on the brain. The third attack will either carry me off, or leave me paralyzed for life.”