I want to know if botox which I had in my neck can cause complications such as hyperthyroid and a thyroid nodular cyst?

Botox & Thyroid. Botox is injected superficially. Hyperthyroidism or thyroid nodular cysts resulting from Botox injections have never been reported. I recommend you check your thyroid function with your primary care provider or endocrinologist.
No it can't. the neuromodulator temporarily stops release of neurotransmitters to weaken muscles and will go away.

Related Questions

Does hyperthyroid and a tiny thyroid nodular cyst cause difficulty swallowing?

Swallowing. If you are hyperthyroid your doctor who diagnosed that should be treating you for it. A tiny thyroid nodular cyst should not cause difficulty swallowing. You should probably have your doctor refer you to an Ear, Nose, and Throat specialist. Read more...