Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 16, 2020
Document And Entity Information
Entity Registrant Name	ETHEMA HEALTH Corp
Entity Central Index Key	0000792935
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
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 Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,841,090,247
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020