Perimenopause, or Something Else?

This page exists because the opposite mistake is just as costly. Being told everything is hormones, when it is a thyroid problem, or iron deficiency, or sleep apnea, wastes exactly as much time as being told it is nothing.

Several conditions produce almost precisely the perimenopause symptom picture. Most are common, most are straightforward to test for, and all of them are treatable once identified.

Thyroid disease

The overlap is close to total: fatigue, weight change, brain fog, hair thinning, dry skin, low mood, cold intolerance, heavier periods. Thyroid disease is substantially more common in women and the incidence rises in exactly this age band.

Worth asking for a full panel rather than TSH alone, since TSH in isolation can look acceptable while the picture underneath is not.

Iron deficiency

Heavy perimenopausal bleeding is one of the most common causes of iron deficiency in adult women, which makes this a symptom of perimenopause that then produces its own set of symptoms.

Fatigue, breathlessness on stairs, hair shedding, poor concentration, restless legs. Ferritin matters here, not just hemoglobin, because stores fall long before anemia appears.

Sleep apnea

Markedly underdiagnosed in women, partly because the expected patient is a snoring man. Risk rises after menopause as the protective effect of progesterone on airway tone is lost.

In women it more often presents as fatigue, morning headache, brain fog and low mood than as obvious snoring. If you wake unrefreshed no matter how long you sleep, this belongs on the list.

Depression and anxiety in their own right

Perimenopause genuinely raises the risk of depression, so these are not alternatives so much as overlapping possibilities. The distinction still matters because treatment differs.

Persistent low mood, loss of interest in things you used to care about, hopelessness and symptoms that do not track your cycle point toward depression needing treatment on its own terms. That is not a failure to manage hormones, and it should not be treated as one.

Vitamin D and B12

Both are common, both produce fatigue, low mood, aching and cognitive symptoms, and both are cheap to check and cheap to correct. There is no good reason to leave them unmeasured.

Blood sugar

Insulin resistance rises through midlife, driven partly by falling estrogen and partly by loss of muscle. It produces afternoon crashes, central weight gain, cravings and fatigue after eating. HbA1c and fasting insulin give a clearer picture than fasting glucose on its own.