Final answer:
Thyroid dysfunction and anemia can cause both hypothyroidism and hyperthyroidism, leading to a variety of symptoms including weight gain, weight loss, cold sensitivity, profuse sweating, reduced mental activity, and increased heart rate.
Step-by-step explanation:
Thyroid dysfunction and anemia can reduce milk supply and also cause hypothyroidism, resulting in weight gain, cold sensitivity, and reduced mental activity. Conversely, hyperthyroidism can occur, resulting in weight loss, profuse sweating, and an increased heart rate. Thyroid dysfunction can also lead to other symptoms such as goiter, impaired growth and development, decreased fertility, and prenatal and infant death.