HealthRX.com · Printable symptom log
Finger symptom log for people taking a GLP-1 medicine
Record which fingers are affected, what the symptom feels like, what sets it off and how long it lasts in the days before your appointment, then bring this sheet. It lists the pattern clues clinicians ask about, the warning signs that should not wait, and questions about B12 testing, nerve tests and your medicines.
Your medicines and timing
GLP-1 medicine and current weekly dose
Date you started it, and date of the last dose increase
Metformin: do you take it, and since when?
Other diabetes medicines, including insulin
Weight change since starting the GLP-1
Date the finger symptoms began
Daily finger log
Name the hand and the fingers (thumb, index, middle, ring, little). Describe the feeling in your own words: tingling, numbness, catching or locking, color change, swelling.
| Date and time | Hand and fingers | What it felt like | What set it off (night, waking, cold, gripping) | How long it lasted | Severity (none to worst) |
|---|---|---|---|---|---|
Pattern clues to mark before the visit
- Numbness or tingling in the thumb, index and middle fingers
- Weak grip, clumsiness or dropping things
- Numbness or tingling in both feet as well as the hands
- A finger that catches, pops or locks when bending
- A tender lump at the base of a finger or thumb, on the palm side
- Stiffness or locking that is worst after waking
- Fingers turning white, then blue, in the cold or with strong emotion
- Puffy or swollen fingers
What the sources say about each pattern
- Carpal tunnel syndrome typically causes numbness or tingling in the thumb and the next two or three fingers; shrinking of the muscle under the thumb appears in advanced or long-term cases.[1]
- A low vitamin B12 level over a long time can damage nerves, causing numbness and tingling of the hands and feet. Long-term metformin use is one listed cause.[2]
- In the DPP Outcomes Study, low or borderline-low B12 was more common with metformin (19.1% vs 9.5% at 5 years), and the authors say routine B12 testing in people taking metformin should be considered.[3]
- Diabetic nerve damage usually starts in the toes and feet; over time the fingers and hands can be affected.[4]
- Trigger finger is more common in people with diabetes. A steroid injection typically raises blood sugar for about 10 to 14 days in people with diabetes who take insulin, so glucose needs close monitoring.[5]
- In Raynaud phenomenon, cold or strong emotions trigger spasms in small blood vessels; attacks may last from minutes to hours.[6]
Contact a clinician promptly
- Right away: fever, swelling and redness of a finger, or a red streak on the hand or wrist (possible infection).[7]
- Fingers that change color in the cold and do not return to their usual color, turn black, or have a sore that will not heal.[6]
- Loss of muscle bulk around the fingers, feeling that keeps getting worse, or dropping things more often.[1]
Questions for your appointment
- Which pattern do my symptoms fit, and what examination or test would confirm it?
- Should my vitamin B12 be checked, given how long I have taken metformin?
- Would a nerve conduction test help tell carpal tunnel apart from a nerve problem in both hands and feet?
- If a steroid injection is offered for trigger finger, how should I watch my blood sugar afterwards?
- Could one of my medicines, smoking or an autoimmune condition explain the color changes?
- Does anything about my GLP-1 dose need to change while this is worked out?
Sources for the facts on this sheet
- MedlinePlus, U.S. National Library of Medicine. Carpal tunnel syndrome (MedlinePlus Medical Encyclopedia). Accessed 2026-10-17. https://medlineplus.gov/ency/article/000433.htm
- MedlinePlus, U.S. National Library of Medicine. Vitamin B12 deficiency anemia (MedlinePlus Medical Encyclopedia). Accessed 2026-10-17. https://medlineplus.gov/ency/article/000574.htm
- Aroda VR, Edelstein SL, Goldberg RB, et al. Long-term Metformin Use and Vitamin B12 Deficiency in the Diabetes Prevention Program Outcomes Study. J Clin Endocrinol Metab 2016. PMID 26900641. https://pubmed.ncbi.nlm.nih.gov/26900641/
- MedlinePlus, U.S. National Library of Medicine. Diabetes and nerve damage (MedlinePlus Medical Encyclopedia). Accessed 2026-10-17. https://medlineplus.gov/ency/article/000693.htm
- OrthoInfo, American Academy of Orthopaedic Surgeons. Trigger Finger (OrthoInfo). Accessed 2026-10-17. https://orthoinfo.aaos.org/en/diseases--conditions/trigger-finger/
- MedlinePlus, U.S. National Library of Medicine. Raynaud phenomenon (MedlinePlus Medical Encyclopedia). Accessed 2026-10-17. https://medlineplus.gov/ency/article/000412.htm
- MedlinePlus, U.S. National Library of Medicine. Tenosynovitis (MedlinePlus Medical Encyclopedia). Accessed 2026-10-17. https://medlineplus.gov/ency/article/001242.htm
This sheet records information for a conversation with your prescriber or pharmacist. It does not replace their instructions or the medication's prescribing information.