I had undergone chemotherapy vs I have undergone chemotherapy

Both phrases are correct, but they are used in different contexts. 'I had undergone chemotherapy' is used when referring to a past event that happened before another past event. 'I have undergone chemotherapy' is used when talking about an experience that happened at an unspecified time in the past and has relevance to the present.

Last updated: March 19, 2024

I had undergone chemotherapy

This phrase is correct when referring to a past event that happened before another past event.

This phrase is used to talk about a completed action in the past that occurred before another past event. It indicates a sequence of events in the past.

Examples:

I had undergone chemotherapy before I started feeling better.
She had undergone chemotherapy when she was diagnosed with cancer.

Alternatives:

I underwent chemotherapy
I had chemotherapy
I had received chemotherapy
I had gone through chemotherapy
I had treatment with chemotherapy

I have undergone chemotherapy

This phrase is correct when talking about an experience that happened at an unspecified time in the past and has relevance to the present.

This phrase is used to talk about a past experience that is relevant to the present moment. It indicates that the action of undergoing chemotherapy has an impact on the present.

Examples:

I have undergone chemotherapy, so I understand what you're going through.
She has undergone chemotherapy, which is why she is cautious about her health.

Alternatives:

I underwent chemotherapy
I have had chemotherapy
I have received chemotherapy
I have gone through chemotherapy
I have had treatment with chemotherapy

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I had undergone chemotherapy vs I have undergone chemotherapy