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396 pages, Paperback
First published August 17, 2004
One other little-known issue for thyroid patients it he seasonal variation in thyroid function. A number of studies show that TSH naturally rises during colder months and drops to a low normal or even a hyperthyroid level in the warmest months. Some doctors adjust for this by prescribing slightly increased dosages during colder months and reducing dosages during warm periods. Most, however, are not aware of this seasonal fluctuation, leaving patients suffering worsening hypothyroidism symptoms during colder months, or going through warmer months suffering with hyperthyroidism symptoms due to slight overdosage. [...] Twice-yearly tests at minimum during winter and summer months can help assess fluctuations and guide seasonal dosage modifications if needed. - (p 50)