🔥 Why this happens (quick answer)
Horizontal lines that appear and disappear on your iPhone screen may be caused by a temporary display glitch, overheating, software problems, a loose internal display connection, screen damage, or a failing OLED or LCD panel.
Sometimes locking and reopening the iPhone makes the lines disappear temporarily.
However, if the lines keep returning or are getting worse, the problem may be hardware-related.
🚀 Quick Fix (Try This First)
✔️ Lock your iPhone and reopen it
✔️ Force restart the iPhone
✔️ Let the phone cool down
✔️ Remove the case temporarily
✔️ Take a screenshot while the lines are visible
That screenshot test can help determine whether the problem is related to software or the physical display.
⚡ 10 Easy Fixes for Horizontal Lines on an iPhone Screen
1. Lock and Reopen Your iPhone
A temporary display glitch may disappear after the screen turns off and refreshes.
Fix:
- Press the Side button
- Wait about 10 seconds
- Wake the iPhone
- Unlock the device
- Check the screen again
If the lines disappear but repeatedly return, continue troubleshooting.
2. Force Restart the iPhone
A normal restart may not clear every temporary display problem.
Fix:
- Quickly press and release the Volume Up button
- Quickly press and release the Volume Down button
- Press and hold the Side button
- Keep holding until the Apple logo appears
- Release the button
- Check the display
A force restart can clear temporary graphics and system glitches.
3. Take a Screenshot While the Lines Are Visible
This is one of the most useful troubleshooting tests.
Fix:
- Wait until the horizontal lines appear
- Take a screenshot
- View the screenshot on another device if possible
- Check whether the lines appear in the screenshot
If the lines appear in the screenshot, the problem may involve software or graphics processing.
If the screenshot looks normal but the physical iPhone screen has lines, the display hardware may be the problem.
4. Let the iPhone Cool Down
Excessive heat can affect display performance.
Fix:
- Stop charging the iPhone
- Close demanding apps
- Remove the case
- Move the phone away from direct sunlight
- Allow it to cool naturally
- Test the screen again
Do not place the iPhone in a refrigerator or freezer.
5. Remove the Case and Screen Protector
Pressure against the display may sometimes make an existing screen problem more noticeable.
Fix:
- Remove the phone case
- Inspect the edges of the screen
- Check for lifting or separation
- Remove a damaged screen protector if necessary
- Use the phone normally and watch for the lines
If the lines disappear, the case or protector may have been contributing to the issue.
6. Check for Recent Drops or Pressure Damage
Display damage does not always create visible cracks.
Fix:
- Think about recent drops
- Check whether the phone was crushed in a pocket or bag
- Inspect the screen edges
- Look for discoloration or flickering
- Gently observe whether the lines change during normal use
Do not press hard on the screen to test it.
Internal display damage can exist even when the glass looks perfect.
7. Update iOS
A software or graphics bug may affect the display.
Fix:
- Open Settings
- Tap General
- Tap Software Update
- Install any available update
- Restart the iPhone
- Check whether the lines return
Keep the iPhone backed up before major software updates.
8. Check Whether the Lines Appear in Certain Apps
The problem may be connected to a specific app.
Fix:
- Open several different apps
- Check the Home Screen
- Open Settings
- Play a video
- Compare when the lines appear
If the lines only appear inside one app, update or reinstall that app.
If the lines appear everywhere, the display itself becomes more suspicious.
9. Back Up the iPhone
If the lines are becoming more frequent, protect your data before the screen becomes difficult to use.
Fix:
- Connect to Wi-Fi
- Open Settings
- Tap your Apple Account name
- Tap iCloud
- Tap iCloud Backup
- Select Back Up Now
You can also back up the iPhone using a Mac or PC.
Do this sooner rather than later if the display problem is getting worse.
10. Have the Display Inspected
Horizontal lines that repeatedly return may indicate display hardware failure.
Fix:
- Contact Apple Support or a reputable repair provider
- Explain when the lines appear
- Mention whether locking the phone temporarily fixes them
- Show photos or videos of the problem
- Explain whether the iPhone was recently dropped or exposed to liquid
If the lines are spreading, flickering, or becoming permanent, the display may need repair or replacement.
❓ Frequently Asked Questions
Why do horizontal lines appear and disappear on my iPhone?
Temporary software glitches, heat, display damage, or a failing screen panel may cause lines to appear intermittently.
Why do the lines disappear when I lock my iPhone?
Turning the screen off and back on refreshes the display. This may temporarily hide a display problem without actually fixing the underlying cause.
Does a normal screenshot mean my iPhone screen is broken?
If the physical screen shows lines but a screenshot viewed on another device looks normal, the problem is more likely related to the display hardware.
Can an iPhone screen fail without being cracked?
Yes. Internal display damage or component failure can occur even when the outer glass looks normal.
Will horizontal lines on an iPhone get worse?
They can. If the lines are appearing more frequently, spreading, or becoming permanent, back up the iPhone and have the display inspected.
🛒 Helpful Products
💡 Final Thoughts
If horizontal lines keep appearing and disappearing on your iPhone screen, start by locking and reopening the phone and performing a force restart.
Next, take a screenshot while the lines are visible and check that screenshot on another device.
If the screenshot looks normal but the physical screen still has lines, the display hardware may be the problem.
And if the lines are becoming more frequent or getting worse, back up your iPhone before the screen becomes difficult to use.
🔗 Related Fixes