Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 1 year ago

Beating our chest is a sign of mourning and sadness on the tragedies of Ahlul Bayt(AS). It was practiced by early Muslims including Ayisha on her father's death (al-Tabaqaat al-Kubba by Ibn Sa'd, V.2, P.201),  and pious believers on the tragedies of Ahlul Bayt (AS). 

It is not self violence  but expressing our feelings which helps us as well as confirm our love and attachment with the Prophet (SAWA) and his Progeny Ahlul Bayt (AS).