There is no single symptom that will diagnose it
Biogerontology 14 , 763775 (2013)
Boroujeni ME, Simani L, Bluyssen HAR, Samadikhah HR, Zamanlui Benisi S, Hassani S, Akbari Dilmaghani N, Fathi M, Vakili K, Mahmoudiasl G-R, Abbaszadeh HA, Hassani Moghaddam M, Abdollahifar M-A, Aliaghaei A (2021) Inflammatory response leads to neuronal death in human post-mortem cerebral cortex in patients with COVID-19
Miscellaneous sources such as exposure to radiation, ozone, cigarette smoke, alcohol, air pollutants, pesticides, industrial chemicals and certain drugs like halothane, paracetamol have been found to generate oxidative stress [28,29,30]