Heavy plugins, large databases, or low host PHP limits can trigger memory exhausted errors. You can try raising the limit in wp-config.php. If the host caps memory below that value, ask the host to raise it.
Edit wp-config.php
Add or update these lines above the “That’s all, stop editing!” comment:
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );Start with conservative values such as 256M / 512M unless you already know you need more. Very large numbers like 1024M only help if the host allows them.
If the change has no effect, contact your host. Some environments ignore WP_MEMORY_LIMIT.
Find the real cause
Memory pressure can also come from another plugin. Enable WP_DEBUG logging and inspect /wp-content/debug.log. See How to use WP_DEBUG.
