| Cover | Aug. 12, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | GUIDED THERAPEUTICS, INC. |
| Entity Central Index Key | 0000924515 |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Emerging Growth Company | false |
| Document Period End Date | Aug. 12, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 0-22179 |
| Entity Tax Identification Number | 58-2029543 |
| Entity Address Address Line 1 | 5835 Peachtree Corners East |
| Entity Address Address Line 2 | Suite B |
| Entity Address City Or Town | Peachtree Corners |
| Entity Address State Or Province | GA |
| Entity Address Postal Zip Code | 30092 |
| City Area Code | 770 |
| Local Phone Number | 242-8723 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
