What are the risks of OCD reaching severe levels ie if left untreated for long, can it cause permanent brain damage or other problems? Thanks

OCD. Ocd can reach severe levels if left untreated. Just watch "the aviator" about howard hughes to watch a depiction. Ocd is correlated with a decrease in brain derived neurotophic factor [fontenelle et al. Psychiatric research 2012 oct.]. Generally speaking, anything that drops your bdnf level is bad for your brain. This could result in decreased memory, "fuzziness, " and mood problems (deperssn).