| Cover | Jun. 04, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 4, 2021 |
| Entity File Number | 000-15078 |
| Entity Registrant Name | ETHEMA HEALTH CORPORATION |
| Entity Central Index Key | 0000792935 |
| Entity Tax Identification Number | 84-1227328 |
| Entity Incorporation, State or Country Code | CO |
| Entity Address, Address Line One | 1590 South Congress |
| Entity Address, City or Town | Palm Springs |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33403 |
| City Area Code | 561 |
| Local Phone Number | 290-0239 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
