Balancing chemical equations is a key chemistry skill. Use these step by step instructions to write and balance chemical equations. Balancing chemical equations is a key chemistry skill. Use these step by step instructions to write and balance chemical equations.
So, there are many signs and symptoms of Selenium Overdose- some occur very early and some occur much later. 1  Early Signs: Some of the early signs of Selenium Toxicity are endocrine hormone disturbances- particularly thyroid issues. Poor hair and nail growth are early signs that are probably the easiest to notice.
Symptoms of overdose. 1  Blue lips, fingernails, or skin. 2  convulsions (seizures) 3  pain in the chest, upper stomach, or throat. 4  severe stomach pain. 5  skin rash. 6  slow or fast heartbeat. 7  swelling around the eyes, face, lips, or tongue. 8  weight gain (rapid)