| Document and Entity Information | Jan. 27, 2025 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 27, 2025 |
| Entity Registrant Name | PROMIS NEUROSCIENCES INC. |
| Entity Incorporation, State or Country Code | A6 |
| Entity File Number | 001-41429 |
| Entity Tax Identification Number | 98-0647155 |
| Entity Address, Address Line One | Suite 200 |
| Entity Address, Adress Line Two | 1920 Yonge Street |
| Entity Address, City or Town | Toronto |
| Entity Address State Or Province | ON |
| Entity Address, Postal Zip Code | M4S 3E2 |
| City Area Code | 416 |
| Local Phone Number | 847-6898 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, no par value per share |
| Trading Symbol | PMN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001374339 |
| Amendment Flag | false |
