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In mild disease, patients present with eyelid retraction. In fact, upper eyelid retraction is the most common ocular sign of Graves' orbitopathy. This finding is associated with lid lag on infraduction (Von Graefe's sign), eye globe lag on supraduction (Kocher's sign), a widened palpebral fissure during fixation (Dalrymple's sign) and an incapacity of closing the eyelids completely ...
Thyrotoxicosis is a rare side effect in dogs receiving levothyroxine treatment due to the half-life and poor absorption. Thyrotoxicosis occurs when a dog is either given too much levothyroxine or has issues with metabolising it. Symptoms include: polypynoea, anxiety, tachycardia, aggression, polyuria, polydipsia, polyphagia, and cachexia. [2]
Thyrotoxic myopathy (TM) is a neuromuscular disorder that develops due to the overproduction of the thyroid hormone thyroxine.Also known as hyperthyroid myopathy, TM is one of many myopathies that lead to muscle weakness and muscle tissue breakdown.
In the absence of Graves' ophthalmopathy, patients may demonstrate other ophthalmic symptoms and signs due to hyperthyroidism: Dry eyes (due to loss of corneal moisture). [24] A sense of irritation, discomfort, or pain in the eyes. A tingling sensation behind the eyes or the feeling of grit or sand in the eyes.
The most common type of hyperthyroidism, Graves' disease, may additionally cause eye problems (Graves' ophthalmopathy) and skin changes of the legs (pretibial myxedema). [6] Thyroid disease may also cause muscle weakness in the form of thyrotoxic myopathy, but this is constant rather than episodic. [5]
Hyperthyroidism has also been linked to an enlarged thyroid gland (goiter), irregular menstrual cycles, high blood pressure, brittle hair, and more prominent eyes, per Johns Hopkins Medicine.
Less commonly, dog families will notice odd body language like crouching, holding the ears back, “whale eyes,” which is kind of like a sideways glance where you can see the white of the eye ...
Signs and symptoms of hyperthyroidism may include irritability, muscle weakness, sleeping problems, a fast heartbeat, poor tolerance of heat, diarrhea and unintentional weight loss. [1] Other symptoms may include thickening of the skin on the shins, known as pretibial myxedema , and eye bulging , a condition caused by Graves' ophthalmopathy . [ 1 ]