Trouble Concentrating or Remembering

Many hypothyroid patients complain of mental "fogginess" and difficulty concentrating. The manner this mental fogginess manifests itself differs from individual to person. In one research, 22% of low-thyroid people reported having greater difficulties with ordinary math, 36% reported thinking slower than normal, and 39% reported having worse memory.

Another research of 14 men and women with untreated hypothyroidism found that they had trouble recalling verbal cues. The reasons for this are not entirely known, although memory problems improve when low thyroid hormone is treated. Difficulties with memory or attention can occur in anybody, but if they are sudden or severe, they may indicate hypothyroidism.