骨关节炎疼痛管理：患者缓解疼痛与日常生活的指南
A clear, practical guide to insulin therapy for people with diabetes. Learn how insulin works, the main types, how to use it safely, and tips for daily life.
Insulin therapy replaces or adds to the insulin your body makes so blood sugar stays in a healthy range. It is required for type 1 diabetes and often needed for type 2 or other forms. Success depends on the right type and dose, regular monitoring, proper injection technique, and close teamwork with your care team. Never stop or change insulin without medical guidance.
Overview
Insulin is a hormone made by the pancreas that helps move sugar (glucose) from your blood into your cells for energy. In diabetes, either the body makes little or no insulin (type 1) or does not use insulin well and may eventually make less of it (type 2 and other forms). Insulin therapy gives you the insulin your body needs through injections, pens, or a pump.
The goal is to keep blood sugar as close to target as safely possible, prevent short-term emergencies like very high or very low blood sugar, and lower the risk of long-term complications that can affect the eyes, kidneys, nerves, and heart. Modern insulin options and delivery devices make therapy more flexible and precise than ever.
Signs & Symptoms
Insulin itself does not cause symptoms when used correctly, but both high and low blood sugar can. High blood sugar (hyperglycemia) may cause increased thirst, frequent urination, fatigue, blurred vision, or slow-healing cuts. Low blood sugar (hypoglycemia) can cause shakiness, sweating, hunger, irritability, confusion, rapid heartbeat, or dizziness.
- Mild low blood sugar: treat quickly with 15 grams of fast-acting carbohydrate (glucose tablets, juice, or regular soda) and recheck in 15 minutes.
- Severe low blood sugar: inability to swallow, seizures, or loss of consciousness requires emergency help and possibly glucagon.
- Very high blood sugar with nausea, vomiting, fruity breath, or deep breathing can signal diabetic ketoacidosis (DKA) and needs urgent care.
Causes & Risk Factors
People need insulin therapy when the pancreas cannot make enough insulin or when other medicines are not enough to control blood sugar. Type 1 diabetes always requires insulin because the immune system destroys insulin-producing cells. Many people with type 2 diabetes eventually need insulin as the condition progresses. Other reasons include gestational diabetes that does not respond to lifestyle changes, certain medications (such as steroids), pancreatic disease, or temporary needs after surgery or illness.
Risk factors for needing insulin include long-standing type 2 diabetes, high A1C despite oral medicines, pregnancy with diabetes, and conditions that increase insulin resistance or reduce insulin production.
Diagnosis
Your healthcare team decides if insulin is needed based on blood sugar patterns, A1C (average blood sugar over about three months), symptoms, and overall health. They may also check C-peptide levels (a marker of how much insulin your body still makes) or antibodies in suspected type 1 diabetes. Continuous glucose monitoring (CGM) or frequent finger-stick checks help show when and how much insulin is required.
Treatment & Management
Insulin comes in several types that differ in how quickly they start working, when they peak, and how long they last. Common categories include rapid-acting (mealtime), short-acting, intermediate-acting, long-acting (basal), and ultra-long-acting. Premixed insulins combine two types in one injection. Your regimen may be basal only, basal-bolus (background plus mealtime), or pump therapy that delivers continuous small amounts plus boluses.
| Insulin Type | Typical Onset | Peak | Duration | Common Use |
|---|---|---|---|---|
| Rapid-acting | About 15 minutes | 1 hour | 2–4 hours | With meals or corrections |
| Short-acting (regular) | 30 minutes | 2–3 hours | 3–6 hours | Meals (less common now) |
| Intermediate (NPH) | 2–4 hours | 4–12 hours | 12–18 hours | Background coverage |
| Long-acting | 1–2 hours | Minimal peak | Up to 24 hours | Basal (background) insulin |
| Ultra-long-acting | 1–6 hours | No peak | 36+ hours | Once-daily basal |
Delivery options include syringes and vials, insulin pens (prefilled or refillable), and insulin pumps (including hybrid closed-loop systems that adjust delivery based on CGM data). Your doctor or diabetes educator will teach injection technique, site rotation (abdomen, thighs, upper arms, buttocks), dose calculation, and storage (unopened in refrigerator; opened pens or vials usually at room temperature for a limited time).
Never share insulin pens, needles, or syringes. Incorrect dosing or skipping insulin can cause dangerous high blood sugar. Always confirm the type and dose before injecting, and carry a source of fast sugar and medical ID.
Living With It
Living well with insulin means building routines around monitoring, meals, activity, and sleep. Check blood sugar or use CGM as recommended, match insulin to carbohydrate intake when using mealtime insulin, and adjust for exercise (which can lower blood sugar). Keep a log or share CGM data with your team so doses can be fine-tuned. Travel with extra supplies, store insulin properly, and plan for sick days when blood sugar often rises and more insulin may be needed.
Emotional support matters. Many people feel anxious about injections, weight changes, or hypoglycemia. Diabetes education programs, support groups, and mental health professionals can help. Regular follow-up visits allow dose adjustments as your body, lifestyle, or other medicines change.
Medical Review Team
WellAlly Medical Editorial Team
This content is not a replacement for professional medical advice.
Recovery & management timeline
Days 1–14
Starting insulin
Learn injection or pump technique with a diabetes educator. Check blood sugar frequently (or start CGM). Keep a detailed log of doses, meals, and readings. Contact your care team promptly for lows or highs.
Weeks 2–8
Dose fine-tuning
Work with your clinician to adjust basal and bolus doses based on patterns. Practice carbohydrate counting if using mealtime insulin. Establish site rotation and storage habits.
Ongoing after adjustment
Stable daily management
Follow your personalized regimen, monitor regularly, and review data at clinic visits. Update the plan for illness, travel, exercise changes, or pregnancy.
Months to years
Long-term optimization
Consider technology upgrades (CGM, smart pens, or automated insulin delivery) if appropriate. Address any barriers such as cost, fear of lows, or injection fatigue with your team.
Self-care steps
1Store and handle insulin correctly
Keep unopened insulin in the refrigerator. Once in use, most pens and vials can stay at room temperature (check the product label for exact days). Never freeze insulin or leave it in hot cars. Discard if cloudy (unless it is NPH or premixed that should be cloudy) or past the in-use date.
2Rotate injection sites
Use a different spot each time within the same general area (abdomen preferred for consistent absorption). Avoid scars, moles, or areas that are swollen or bruised. This helps prevent lipohypertrophy (lumpy tissue that can affect absorption).
3Monitor and treat lows promptly
Always carry 15 grams of fast-acting carbohydrate and a glucagon kit if prescribed. Teach family or coworkers how to help in an emergency. Recheck blood sugar 15 minutes after treating a low.
4Match insulin to food and activity
If using mealtime insulin, count carbohydrates and dose accordingly. Reduce insulin or add a snack for exercise as advised by your team. Stay consistent with meal timing when possible.
5Prepare for sick days and travel
Never stop basal insulin when ill even if you are not eating much. Check blood sugar and ketones more often. Pack double supplies, a cooler for insulin if needed, and a letter from your doctor for travel.
When to seek medical help
Seek emergency care right away for severe hypoglycemia (confusion, seizures, loss of consciousness, or inability to swallow), signs of diabetic ketoacidosis (very high blood sugar with nausea, vomiting, abdominal pain, fruity-smelling breath, deep rapid breathing, or extreme drowsiness), or any sudden severe illness with uncontrolled blood sugar. Call your diabetes care team promptly for repeated lows, unexplained highs, injection-site problems, or if you cannot keep food or fluids down.
Frequently asked questions
Will I need insulin forever?
Does insulin cause weight gain?
Is an insulin pump better than injections?
What should I do if I miss a dose?
Can I drink alcohol while on insulin?
Sources
- 1
- 2
- 3
- 4
- 5NHS – Insulin TherapySource
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Medical Editorial Team · Last reviewed October 9, 2026. · Read our editorial policy