Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 24, 2001
Document And Entity Information
Entity Registrant Name	ETHEMA HEALTH Corp
Entity Central Index Key	0000792935
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	true
Is Entity's Reporting Status Current?	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021