The ethnic Rakhine (Arakanese) monk was imprisoned several times by the British colonial government for his anti-colonialist political activities.

Upon his return to British Burma, U Ottama started his political activities, toured the country, lecturing for the Young Men's Buddhist Association and giving anti-colonial speeches.

Inspired by Gandhian principles, U Ottama advocated nonviolent resistance, promoting peaceful protests, boycotts of British goods, and a revival of indigenous values and self-reliance.

He framed his opposition to colonial rule through Buddhist ethics, creating a compelling message that strongly resonated with the Burmese people.

While Ashin Ottama did not hold any post in any organization, he encouraged and participated in many peaceful demonstrations and strikes against British rule.

These commemorations are often referred to as "U Ottama Day" is served to honor his memory and to remind contemporary generations of the long struggle against colonial oppression.