Unexplained high cholesterol
High cholesterol is sometimes the only evidence of an underactive thyroid in an older person. The problem might be diagnosed as a cholesterol disorder rather than hypothyroidism. Because this sign may stand alone, high cholesterol warrants a thyroid evaluation.
Reduced blood volume, weaker contractions of the heart muscle, and a slower heart rate – all caused by low thyroid hormone levels – can contribute to heart failure, a serious condition that occurs when your heart can’t pump out enough blood to meet the needs of your body.
The ineffective pumping also causes blood to back up in the veins that return blood to the heart.
Blood backs up all the way into the lungs, which causes them to become congested with fluid. Symptoms of heart failure include breathlessness, swelling in the ankles, weakness, and fatigue.
Bowel movement changes
An older person with hypothyroidism might have constipation because stool moves more slowly through the bowels.
A less common hypothyroidism symptom is frequent bouts of diarrhoea, a problem more typically associated with hyperthyroidism.
Some people with an autoimmune thyroid disease such as Hashimoto’s also have celiac disease, another autoimmune condition that can cause diarrhoea.
Joint or muscle pain
Vague joint pain is a classic hypothyroidism symptom. It sometimes is the only symptom of hypothyroidism in an older person.
Many people experience general muscle aches, particularly in large muscle groups like those in the legs.
Clinical depression, a common symptom in younger people with hypothyroidism, can also affect older people with the condition.
The difference is that in older people it can be the only hypothyroidism symptom. Some older adults also develop psychosis with delusional behaviour or hallucinations.
Debilitating memory loss that is often, but not always, accompanied by depression or psychosis can also be the lone symptom of hypothyroidism.
If you or a loved one is being evaluated for dementia, make sure that a thyroid test is part of the evaluation.
Hypothyroidism can lead to abnormalities in the cerebellum (a region at the back of the brain that’s involved in motor control). This may cause problems with walking in older people.
Source: Harvard Medical School